New JK ---26.8mpg Sweet!
JK Super Freak
Joined: Nov 2007
Posts: 1,259
Likes: 0
From: Massachusett
I'm getting 17 on avg over 5 tank fulls. I have a 4dr, with 6speed, 4.10 gears and 35" tires. I do notice it dropped when I played with the tire pressure by 1 mpg avg. The tire place had them set at 40 lbs and I'm running 30 now. Tires max is 60 according to manufacturer.
I'm going back up to 36 as this is what felt best.
I'm going back up to 36 as this is what felt best.
Super Moderator
Joined: Sep 2007
Posts: 1,728
Likes: 80
From: Arizona
Nope don't trust the computer.
Next time you fill up, make sure the pump nozzle clicks off a couple times and you know your tank is absolutely full of gasoline. Then write your odometer mileage reading on a piece of paper and scotch tape it to your dash. Now drive the next 250 miles or so as you normally would, so that the gas tank is getting low, but your not risking running out of gas. You can guarantee that pretty much by looking up your gas tank capacity in your car's owner's manual and figuring out how many miles you could go even if your gas mileage is at the low end of the manufacturer's specification for your type of highway and/or in city driving pattern. When you finally fill up your gasoline tank the next time, simply record the current odometer mileage and having made sure to fill the tank completely full again as above, record the exact number of gallons required to fill the tank up (shown on the pump). Then subtract to find out how many miles you drove and form the quotient of the number of miles driven divided by the number of gallons used. That is your miles per gallon gas mileage.
Next time you fill up, make sure the pump nozzle clicks off a couple times and you know your tank is absolutely full of gasoline. Then write your odometer mileage reading on a piece of paper and scotch tape it to your dash. Now drive the next 250 miles or so as you normally would, so that the gas tank is getting low, but your not risking running out of gas. You can guarantee that pretty much by looking up your gas tank capacity in your car's owner's manual and figuring out how many miles you could go even if your gas mileage is at the low end of the manufacturer's specification for your type of highway and/or in city driving pattern. When you finally fill up your gasoline tank the next time, simply record the current odometer mileage and having made sure to fill the tank completely full again as above, record the exact number of gallons required to fill the tank up (shown on the pump). Then subtract to find out how many miles you drove and form the quotient of the number of miles driven divided by the number of gallons used. That is your miles per gallon gas mileage.
1. DON'T top-off. It will screw up your evap canister for sure! Also the vapor recovery system in the nozzle (if your state requires them) might actually suck some gas back out of your filler neck if it's that full. Free Gas! (for the station).
2. DO this method over several tanks. It's more accurate and you don't have to worry about toping off.
By keeping my mitts off of the MPG reset button between fills, I found out mine is reasonably accurate (+/- 1 MPG).
JK Jedi Master
Joined: Feb 2008
Posts: 12,904
Likes: 185
From: Maine
Here in Maine, there is no east-west highway. So, going east-west is on 45 mph roads, no stop lights to speak of. I have found 45 nonstop miles per hour for a long time is optimal for good gas mileage. Under these conditions, I easily get 24 mpg. And it doesn't make much difference if it is in overdrive or not.
JK Enthusiast
Joined: Jul 2008
Posts: 197
Likes: 0
From: Florence, SC
Here in Maine, there is no east-west highway. So, going east-west is on 45 mph roads, no stop lights to speak of. I have found 45 nonstop miles per hour for a long time is optimal for good gas mileage. Under these conditions, I easily get 24 mpg. And it doesn't make much difference if it is in overdrive or not.
JK Jedi
Joined: Oct 2007
Posts: 5,537
Likes: 0
From: Colorado
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JK Super Freak
Joined: Jun 2007
Posts: 1,350
Likes: 2
From: North East Kingdom, Vermont
Here in Maine, there is no east-west highway. So, going east-west is on 45 mph roads, no stop lights to speak of. I have found 45 nonstop miles per hour for a long time is optimal for good gas mileage. Under these conditions, I easily get 24 mpg. And it doesn't make much difference if it is in overdrive or not.
4500 miles on a stock '08 Rubi auto.
It's not bad, but my '87 full size Blazer that I traded on the Jeep had a lifetime average of 17 mph, that was with a 350, 4 Spd (w/granny lo),on 31"tires, and I think it was 3.73 rears. So the 21 is ok, but it should be better. Then again I just got rid of an '89 FS Bronco, 351 W, auto, 33's, no idea what rears it had, I would have been thrilled to get 10 mpg's outa that beast.
So compared to the Bronco, I am truly thrilled, compared to the Blazer I think Jeep missed the boat. I would gladly take the Jeep with the 350 and 17mpg over the little 3.8 with 21mpg's......GIMMIE BACK MY CUBIS!!!
There is no real complaint in that, I have no problem with the 3.8, I just think it should do better compared with the big 8 in a 1500lb heaver truck.
JK Super Freak
Joined: Jun 2007
Posts: 1,350
Likes: 2
From: North East Kingdom, Vermont
The dealer got my old Blazer about 2 months before I finally got the Jeep, and I had to use the Bronco as my DD. I could drive and watch the fuel gauge going down. Had I gone straight from the Blazer to the Jeep I might feel more disappointed, but going from the Bronco, even with todays prices my fuel costs are almost cut in half.
JK Jedi
Joined: Apr 2008
Posts: 5,168
Likes: 1
From: texarkana,tx
I feel your pain! The dealer got my old Blazer about 2 months before I finally got the Jeep, and I had to use the Bronco as my DD. I could drive and watch the fuel gauge going down. Had I gone straight from the Blazer to the Jeep I might feel more disappointed, but going from the Bronco, even with todays prices my fuel costs are almost cut in half.
The dealer got my old Blazer about 2 months before I finally got the Jeep, and I had to use the Bronco as my DD. I could drive and watch the fuel gauge going down. Had I gone straight from the Blazer to the Jeep I might feel more disappointed, but going from the Bronco, even with todays prices my fuel costs are almost cut in half.