Anyone using Premium
JK Enthusiast
Joined: Dec 2007
Posts: 246
Likes: 0
From: Bradenton, FL
Now that there are some programmers out there, slap on a CAI and a tune and yes, you can make your Jeep require high octane. Myself, so far I think the HP gains are laughable so I am gonna stick to 87 octane at 25 cents or more less per gallon, plus spending like $800 for 10 hp is insanity if you ask me.
Running high octane in an engine that doesn't need it doesn't do anything except burn a hole in your wallet.
JK Newbie
Joined: Jun 2007
Posts: 59
Likes: 0
My .02
Myths about Unleaded Gasoline
1. Myth: The higher the octane, the slower the burn.
Fact: In many cases, high octane gasoline has faster burning characteristics than low octane gasoline. It is rarely slower.
2. Myth: Too much octane reduces horsepower.
Fact: Trying a higher octane fuel and getting less performance is usually due to introducing additional variables with the different gasoline which can be overcome by re-tuning the engine.
3. Myth: Too much octane will burn up my engine.
Fact: The only time your engine is aware of octane is when it doesn't have enough. Using a higher octane than the engine needs does not hurt or help.
4. Myth: Street gasoline with oxygenates is junk.
Fact: Street gasolines of today, especially in California, are the best performance gasolines next to racing gasoline.
5. Myth: Leaded gasoline makes more horsepower than unleaded.
Fact: Leaded gasoline is legal for "sanctioned off-highway events only and does not allow the engine to make more power unless detonation is present. More power can be made with a street legal oxygenated unleaded gasoline than with leaded gasoline as long as there is no detonation.
6. Myth: Adding nitromethane to gasoline improves power.
Fact: Nitro knocks the octane number down severely, and makes the mixture way too lean. Jeff Smith, formerly of Hot Rod Magazine, tried this a few years back and destroyed an engine before he got the Air/Fuel ratio correct.
7. Myth: Octane number is power.
Fact: Octane number is resistance to detonation. Higher octane will increase power only if detonation is present.
8. Myth: The octane requirement of my engine is always the same.
Fact: Operating conditions like air temperature, barometric pressure, humidity, and coolant temperature have an impact on engine octane requirement.
9. Myth: Detonation and Pre-ignition are the same.
Fact: Detonation can hurt your engine; Pre-ignition will destroy it.
10. Myth: Mixing regular and premium gasolines is not a good idea.
Fact: All gasolines are miscible and no adverse effects will develop when mixing two or more grades. It is not really necessary to mix gasolines since there are three grades of unleaded gasoline at most service stations.
11. Myth: Octane number is simply a ploy by the oil companies to sell more expensive gasoline.
Fact: Approximately 70°/o of the cars on the road in the US are satisfied with 87 octane or lower. The other 30% need a higher octane gasoline. The higher octane gasolines are available for the people that have cars that need these products because of high compression ratio, or high performance in general. Many automobile manufacturers recommend the use of premium grade gasolines in some or all of their engines. (Cadillac, BMW, Corvette, Mercedes Benz, Lincoln, etc.) We make 76 Competition 100 Octane Unleaded Gasoline for people with highperformance cars that want a higher octane gasoline than what is normally available at the pump.
12. Myth: Gasoline is the same all year in all parts of the US.
Fact: Gasoline is "seasonally adjusted" based on the temperature that is anticipated in that particular marketing area. Changes are made at least six times per year in all areas of the US except Hawaii. A "seasonal adjustment" means that the gasoline is
blended to vaporize more readily in the winter than in the summer. This feature allows cold starts without stalls, and good driveability (no hesitations, stumbles, etc.) while the engine is warming up.
13. Myth: My owner's manual says to use premium grade gasoline, but I use 87 octane and don't hear any ping.
Fact: Many engines that have premium fuel recommendations also have knock sensors. The knock sensor knows when the engine pings and retards the spark timing until ping is gone. This all takes place at a sound level below what the human ear can detect, so the knock sensor may be saving your engine even though you don't know it. The retarded timing will reduce horsepower and fuel economy, so it is best to stay with the car manufacturer recommendation for gasoline octane.
14. Myth: I buy premium grade gasoline because it has more and better additives to keep my injectors and valves clean.
Fact: All gasolines sold in the US are required by law to contain an additive that will keep injectors and valves clean. Tests are required and the additive must be licensed with EPA before it can be used. Most companies use the same amount of additive in all grades of their gasoline
1. Myth: The higher the octane, the slower the burn.
Fact: In many cases, high octane gasoline has faster burning characteristics than low octane gasoline. It is rarely slower.
2. Myth: Too much octane reduces horsepower.
Fact: Trying a higher octane fuel and getting less performance is usually due to introducing additional variables with the different gasoline which can be overcome by re-tuning the engine.
3. Myth: Too much octane will burn up my engine.
Fact: The only time your engine is aware of octane is when it doesn't have enough. Using a higher octane than the engine needs does not hurt or help.
4. Myth: Street gasoline with oxygenates is junk.
Fact: Street gasolines of today, especially in California, are the best performance gasolines next to racing gasoline.
5. Myth: Leaded gasoline makes more horsepower than unleaded.
Fact: Leaded gasoline is legal for "sanctioned off-highway events only and does not allow the engine to make more power unless detonation is present. More power can be made with a street legal oxygenated unleaded gasoline than with leaded gasoline as long as there is no detonation.
6. Myth: Adding nitromethane to gasoline improves power.
Fact: Nitro knocks the octane number down severely, and makes the mixture way too lean. Jeff Smith, formerly of Hot Rod Magazine, tried this a few years back and destroyed an engine before he got the Air/Fuel ratio correct.
7. Myth: Octane number is power.
Fact: Octane number is resistance to detonation. Higher octane will increase power only if detonation is present.
8. Myth: The octane requirement of my engine is always the same.
Fact: Operating conditions like air temperature, barometric pressure, humidity, and coolant temperature have an impact on engine octane requirement.
9. Myth: Detonation and Pre-ignition are the same.
Fact: Detonation can hurt your engine; Pre-ignition will destroy it.
10. Myth: Mixing regular and premium gasolines is not a good idea.
Fact: All gasolines are miscible and no adverse effects will develop when mixing two or more grades. It is not really necessary to mix gasolines since there are three grades of unleaded gasoline at most service stations.
11. Myth: Octane number is simply a ploy by the oil companies to sell more expensive gasoline.
Fact: Approximately 70°/o of the cars on the road in the US are satisfied with 87 octane or lower. The other 30% need a higher octane gasoline. The higher octane gasolines are available for the people that have cars that need these products because of high compression ratio, or high performance in general. Many automobile manufacturers recommend the use of premium grade gasolines in some or all of their engines. (Cadillac, BMW, Corvette, Mercedes Benz, Lincoln, etc.) We make 76 Competition 100 Octane Unleaded Gasoline for people with highperformance cars that want a higher octane gasoline than what is normally available at the pump.
12. Myth: Gasoline is the same all year in all parts of the US.
Fact: Gasoline is "seasonally adjusted" based on the temperature that is anticipated in that particular marketing area. Changes are made at least six times per year in all areas of the US except Hawaii. A "seasonal adjustment" means that the gasoline is
blended to vaporize more readily in the winter than in the summer. This feature allows cold starts without stalls, and good driveability (no hesitations, stumbles, etc.) while the engine is warming up.
13. Myth: My owner's manual says to use premium grade gasoline, but I use 87 octane and don't hear any ping.
Fact: Many engines that have premium fuel recommendations also have knock sensors. The knock sensor knows when the engine pings and retards the spark timing until ping is gone. This all takes place at a sound level below what the human ear can detect, so the knock sensor may be saving your engine even though you don't know it. The retarded timing will reduce horsepower and fuel economy, so it is best to stay with the car manufacturer recommendation for gasoline octane.
14. Myth: I buy premium grade gasoline because it has more and better additives to keep my injectors and valves clean.
Fact: All gasolines sold in the US are required by law to contain an additive that will keep injectors and valves clean. Tests are required and the additive must be licensed with EPA before it can be used. Most companies use the same amount of additive in all grades of their gasoline
JK Jedi
Joined: Oct 2007
Posts: 5,537
Likes: 0
From: Colorado
Myths about Unleaded Gasoline
1. Myth: The higher the octane, the slower the burn.
Fact: In many cases, high octane gasoline has faster burning characteristics than low octane gasoline. It is rarely slower.
2. Myth: Too much octane reduces horsepower.
Fact: Trying a higher octane fuel and getting less performance is usually due to introducing additional variables with the different gasoline which can be overcome by re-tuning the engine.
3. Myth: Too much octane will burn up my engine.
Fact: The only time your engine is aware of octane is when it doesn't have enough. Using a higher octane than the engine needs does not hurt or help.
4. Myth: Street gasoline with oxygenates is junk.
Fact: Street gasolines of today, especially in California, are the best performance gasolines next to racing gasoline.
5. Myth: Leaded gasoline makes more horsepower than unleaded.
Fact: Leaded gasoline is legal for "sanctioned off-highway events only and does not allow the engine to make more power unless detonation is present. More power can be made with a street legal oxygenated unleaded gasoline than with leaded gasoline as long as there is no detonation.
6. Myth: Adding nitromethane to gasoline improves power.
Fact: Nitro knocks the octane number down severely, and makes the mixture way too lean. Jeff Smith, formerly of Hot Rod Magazine, tried this a few years back and destroyed an engine before he got the Air/Fuel ratio correct.
7. Myth: Octane number is power.
Fact: Octane number is resistance to detonation. Higher octane will increase power only if detonation is present.
8. Myth: The octane requirement of my engine is always the same.
Fact: Operating conditions like air temperature, barometric pressure, humidity, and coolant temperature have an impact on engine octane requirement.
9. Myth: Detonation and Pre-ignition are the same.
Fact: Detonation can hurt your engine; Pre-ignition will destroy it.
10. Myth: Mixing regular and premium gasolines is not a good idea.
Fact: All gasolines are miscible and no adverse effects will develop when mixing two or more grades. It is not really necessary to mix gasolines since there are three grades of unleaded gasoline at most service stations.
11. Myth: Octane number is simply a ploy by the oil companies to sell more expensive gasoline.
Fact: Approximately 70°/o of the cars on the road in the US are satisfied with 87 octane or lower. The other 30% need a higher octane gasoline. The higher octane gasolines are available for the people that have cars that need these products because of high compression ratio, or high performance in general. Many automobile manufacturers recommend the use of premium grade gasolines in some or all of their engines. (Cadillac, BMW, Corvette, Mercedes Benz, Lincoln, etc.) We make 76 Competition 100 Octane Unleaded Gasoline for people with highperformance cars that want a higher octane gasoline than what is normally available at the pump.
12. Myth: Gasoline is the same all year in all parts of the US.
Fact: Gasoline is "seasonally adjusted" based on the temperature that is anticipated in that particular marketing area. Changes are made at least six times per year in all areas of the US except Hawaii. A "seasonal adjustment" means that the gasoline is
blended to vaporize more readily in the winter than in the summer. This feature allows cold starts without stalls, and good driveability (no hesitations, stumbles, etc.) while the engine is warming up.
13. Myth: My owner's manual says to use premium grade gasoline, but I use 87 octane and don't hear any ping.
Fact: Many engines that have premium fuel recommendations also have knock sensors. The knock sensor knows when the engine pings and retards the spark timing until ping is gone. This all takes place at a sound level below what the human ear can detect, so the knock sensor may be saving your engine even though you don't know it. The retarded timing will reduce horsepower and fuel economy, so it is best to stay with the car manufacturer recommendation for gasoline octane.
14. Myth: I buy premium grade gasoline because it has more and better additives to keep my injectors and valves clean.
Fact: All gasolines sold in the US are required by law to contain an additive that will keep injectors and valves clean. Tests are required and the additive must be licensed with EPA before it can be used. Most companies use the same amount of additive in all grades of their gasoline
1. Myth: The higher the octane, the slower the burn.
Fact: In many cases, high octane gasoline has faster burning characteristics than low octane gasoline. It is rarely slower.
2. Myth: Too much octane reduces horsepower.
Fact: Trying a higher octane fuel and getting less performance is usually due to introducing additional variables with the different gasoline which can be overcome by re-tuning the engine.
3. Myth: Too much octane will burn up my engine.
Fact: The only time your engine is aware of octane is when it doesn't have enough. Using a higher octane than the engine needs does not hurt or help.
4. Myth: Street gasoline with oxygenates is junk.
Fact: Street gasolines of today, especially in California, are the best performance gasolines next to racing gasoline.
5. Myth: Leaded gasoline makes more horsepower than unleaded.
Fact: Leaded gasoline is legal for "sanctioned off-highway events only and does not allow the engine to make more power unless detonation is present. More power can be made with a street legal oxygenated unleaded gasoline than with leaded gasoline as long as there is no detonation.
6. Myth: Adding nitromethane to gasoline improves power.
Fact: Nitro knocks the octane number down severely, and makes the mixture way too lean. Jeff Smith, formerly of Hot Rod Magazine, tried this a few years back and destroyed an engine before he got the Air/Fuel ratio correct.
7. Myth: Octane number is power.
Fact: Octane number is resistance to detonation. Higher octane will increase power only if detonation is present.
8. Myth: The octane requirement of my engine is always the same.
Fact: Operating conditions like air temperature, barometric pressure, humidity, and coolant temperature have an impact on engine octane requirement.
9. Myth: Detonation and Pre-ignition are the same.
Fact: Detonation can hurt your engine; Pre-ignition will destroy it.
10. Myth: Mixing regular and premium gasolines is not a good idea.
Fact: All gasolines are miscible and no adverse effects will develop when mixing two or more grades. It is not really necessary to mix gasolines since there are three grades of unleaded gasoline at most service stations.
11. Myth: Octane number is simply a ploy by the oil companies to sell more expensive gasoline.
Fact: Approximately 70°/o of the cars on the road in the US are satisfied with 87 octane or lower. The other 30% need a higher octane gasoline. The higher octane gasolines are available for the people that have cars that need these products because of high compression ratio, or high performance in general. Many automobile manufacturers recommend the use of premium grade gasolines in some or all of their engines. (Cadillac, BMW, Corvette, Mercedes Benz, Lincoln, etc.) We make 76 Competition 100 Octane Unleaded Gasoline for people with highperformance cars that want a higher octane gasoline than what is normally available at the pump.
12. Myth: Gasoline is the same all year in all parts of the US.
Fact: Gasoline is "seasonally adjusted" based on the temperature that is anticipated in that particular marketing area. Changes are made at least six times per year in all areas of the US except Hawaii. A "seasonal adjustment" means that the gasoline is
blended to vaporize more readily in the winter than in the summer. This feature allows cold starts without stalls, and good driveability (no hesitations, stumbles, etc.) while the engine is warming up.
13. Myth: My owner's manual says to use premium grade gasoline, but I use 87 octane and don't hear any ping.
Fact: Many engines that have premium fuel recommendations also have knock sensors. The knock sensor knows when the engine pings and retards the spark timing until ping is gone. This all takes place at a sound level below what the human ear can detect, so the knock sensor may be saving your engine even though you don't know it. The retarded timing will reduce horsepower and fuel economy, so it is best to stay with the car manufacturer recommendation for gasoline octane.
14. Myth: I buy premium grade gasoline because it has more and better additives to keep my injectors and valves clean.
Fact: All gasolines sold in the US are required by law to contain an additive that will keep injectors and valves clean. Tests are required and the additive must be licensed with EPA before it can be used. Most companies use the same amount of additive in all grades of their gasoline
JK Enthusiast
Joined: Jun 2007
Posts: 209
Likes: 0
Always use 87. Jeep always recommend to use only 87 octaine gasoline.
Owner's Manual P.321 says the engine is designed to use 87 octaine gasoline and says NOT to use premium gasoline. It says "The use of premium gasoline is NOT recommended... in some circumstances may result in poor performance..."
Owner's Manual P.321 says the engine is designed to use 87 octaine gasoline and says NOT to use premium gasoline. It says "The use of premium gasoline is NOT recommended... in some circumstances may result in poor performance..."
Premium gas is designed for high compression engines with very high voltage ignition systems and Wranglers don't have either
JK Junkie
Joined: May 2007
Posts: 2,288
Likes: 0
From: Treasure Coast, Florida
Wow
...
This thread is still here
...
Well, here goes nothing.
When this whole thread started there was an argument going between several of us who have now been on this site for quite some time. If I'm not mistaken it all started when I had mentioned that I had gotten better mileage from mid-grade gas than I had with high or low-grade. There were quite a few people who had given their input on this subject that, for lack of better words, were fairly opinionated about what fuel they thought was best without trial or experience before voicing their thoughts. What I found to be frustrating was that I had posted my findings and added my personal experiences simply to try to be helpful, just as most do on this forum. In doing so I found quite a bit of adversity from a few individuals, which was quite unexpected. It's funny, even over the span of a year that the faces have changed but the argument remains.
I don't know why but here, I'll give it just one more shot...
Most of you who have been on this site a while know I'm not a big BS'er, I try to give thoughtful input (mostly), I'm fairly respectful, I try not to be condescending, and I am contributive to conversation.Oh, and I contribute to our sponsors to help this ship stay afloat (like it really needs anymore help
).
It has been my personal experience that mid-grade fuel is far superior in my Jeep. I have tried many combinations, computer upgrades, and add-ons (Those who've followed my posts, and upgrades know this is factual). With or without these mods my mileage, and better yet, power on the highway is and has been best with the mid-grade fuel. I will add that I live in warm weather and at sea level. With 35" tires I cannot put low-grade in or I can't maintain cruise over 65 without it constantly changing back into 3rd (auto). With mid-grade, however, it never downshifts on my usual commute (mostly flat land w/ a couple overpasses). This is evidence enough for me that I have made a good decision. I suppose the 2mpg mileage gain is a bonus too (using the top off the tank to miles traveled method over a several fill-up period).
For those of you who don't care to believe this, that's cool, no probs. But for those who are open minded and willing to give it a shot, I assure you that it's a worthy change.
Love ya!
... This thread is still here
...Well, here goes nothing
.When this whole thread started there was an argument going between several of us who have now been on this site for quite some time. If I'm not mistaken it all started when I had mentioned that I had gotten better mileage from mid-grade gas than I had with high or low-grade. There were quite a few people who had given their input on this subject that, for lack of better words, were fairly opinionated about what fuel they thought was best without trial or experience before voicing their thoughts. What I found to be frustrating was that I had posted my findings and added my personal experiences simply to try to be helpful, just as most do on this forum. In doing so I found quite a bit of adversity from a few individuals, which was quite unexpected. It's funny, even over the span of a year that the faces have changed but the argument remains.
I don't know why but here, I'll give it just one more shot... Most of you who have been on this site a while know I'm not a big BS'er, I try to give thoughtful input (mostly), I'm fairly respectful, I try not to be condescending, and I am contributive to conversation.Oh, and I contribute to our sponsors to help this ship stay afloat (like it really needs anymore help
). It has been my personal experience that mid-grade fuel is far superior in my Jeep. I have tried many combinations, computer upgrades, and add-ons (Those who've followed my posts, and upgrades know this is factual). With or without these mods my mileage, and better yet, power on the highway is and has been best with the mid-grade fuel. I will add that I live in warm weather and at sea level. With 35" tires I cannot put low-grade in or I can't maintain cruise over 65 without it constantly changing back into 3rd (auto). With mid-grade, however, it never downshifts on my usual commute (mostly flat land w/ a couple overpasses). This is evidence enough for me that I have made a good decision. I suppose the 2mpg mileage gain is a bonus too (using the top off the tank to miles traveled method over a several fill-up period).
For those of you who don't care to believe this, that's cool, no probs. But for those who are open minded and willing to give it a shot, I assure you that it's a worthy change.
Love ya!
JK Jedi
Joined: Feb 2007
Posts: 7,568
Likes: 3
From: Denver, CO
Wow...
This thread is still here...
Well, here goes nothing.
When this whole thread started there was an argument going between several of us who have now been on this site for quite some time. If I'm not mistaken it all started when I had mentioned that I had gotten better mileage from mid-grade gas than I had with high or low-grade. There were quite a few people who had given their input on this subject that, for lack of better words, were fairly opinionated about what fuel they thought was best without trial or experience before voicing their thoughts. What I found to be frustrating was that I had posted my findings and added my personal experiences simply to try to be helpful, just as most do on this forum. In doing so I found quite a bit of adversity from a few individuals, which was quite unexpected. It's funny, even over the span of a year that the faces have changed but the argument remains.
I don't know why but here, I'll give it just one more shot...
Most of you who have been on this site a while know I'm not a big BS'er, I try to give thoughtful input (mostly), I'm fairly respectful, I try not to be condescending, and I am contributive to conversation.Oh, and I contribute to our sponsors to help this ship stay afloat (like it really needs anymore help).
It has been my personal experience that mid-grade fuel is far superior in my Jeep. I have tried many combinations, computer upgrades, and add-ons (Those who've followed my posts, and upgrades know this is factual). With or without these mods my mileage, and better yet, power on the highway is and has been best with the mid-grade fuel. I will add that I live in warm weather and at sea level. With 35" tires I cannot put low-grade in or I can't maintain cruise over 65 without it constantly changing back into 3rd (auto). With mid-grade, however, it never downshifts on my usual commute (mostly flat land w/ a couple overpasses). This is evidence enough for me that I have made a good decision. I suppose the 2mpg mileage gain is a bonus too (using the top off the tank to miles traveled method over a several fill-up period).
For those of you who don't care to believe this, that's cool, no probs. But for those who are open minded and willing to give it a shot, I assure you that it's a worthy change.
Love ya!
... This thread is still here
...Well, here goes nothing
.When this whole thread started there was an argument going between several of us who have now been on this site for quite some time. If I'm not mistaken it all started when I had mentioned that I had gotten better mileage from mid-grade gas than I had with high or low-grade. There were quite a few people who had given their input on this subject that, for lack of better words, were fairly opinionated about what fuel they thought was best without trial or experience before voicing their thoughts. What I found to be frustrating was that I had posted my findings and added my personal experiences simply to try to be helpful, just as most do on this forum. In doing so I found quite a bit of adversity from a few individuals, which was quite unexpected. It's funny, even over the span of a year that the faces have changed but the argument remains.
I don't know why but here, I'll give it just one more shot... Most of you who have been on this site a while know I'm not a big BS'er, I try to give thoughtful input (mostly), I'm fairly respectful, I try not to be condescending, and I am contributive to conversation.Oh, and I contribute to our sponsors to help this ship stay afloat (like it really needs anymore help
). It has been my personal experience that mid-grade fuel is far superior in my Jeep. I have tried many combinations, computer upgrades, and add-ons (Those who've followed my posts, and upgrades know this is factual). With or without these mods my mileage, and better yet, power on the highway is and has been best with the mid-grade fuel. I will add that I live in warm weather and at sea level. With 35" tires I cannot put low-grade in or I can't maintain cruise over 65 without it constantly changing back into 3rd (auto). With mid-grade, however, it never downshifts on my usual commute (mostly flat land w/ a couple overpasses). This is evidence enough for me that I have made a good decision. I suppose the 2mpg mileage gain is a bonus too (using the top off the tank to miles traveled method over a several fill-up period).
For those of you who don't care to believe this, that's cool, no probs. But for those who are open minded and willing to give it a shot, I assure you that it's a worthy change.
Love ya!
JK Junkie
Joined: May 2007
Posts: 2,288
Likes: 0
From: Treasure Coast, Florida
I don't doubt thats the case in florida...as the myth post points out, the needed grade can be changed by environmental conidtions such as barometric pressure and humidity. You probably need higher grade fuel for the same reason a lot of coloradans use 85 octane fuel. heck some places in colorado I've been that's all they sell.
