In an auto yes but manual no. I'm sorry but with 513 gears your not going to gain mpg.

 

Dissenting opinions are good. It provokes thought. And yes, I am in a minorty on this one but that is okay, and I am not alone. I am used to that though. I voted for McCain but was clearly in the minority. Does that mean I was wrong? No, it doesn't. I have had countless people come to me and say they made a mistake voting for obama. Again, I was in the minority. How's that Hope and Change working out for you.

So, trying here to get people to stop drinking the cool aid and think for themselves. Is that a bad thing? No, it's not. Does it make me wrong? No, it doesn't. There was a thread a while back with a poll asking about gearing and about if people thought they went too low in their gearing. There were a fair amount who said yes, they went too low on their gearing by listening to the experts. Now, the OP of that thread discounted many of those dissenters by looking at their profile and if it hadn't been updated he tossed that vote out. Now, it was his thread and he can do what he wants but IMHO that is disingenuous. Were pro votes thrown out for the same reason. No. Were votes allowed because someone voted the way he wanted but still showed 3.73 gears in their profile. Yes. So, he stacked the deck in his favor. Tha's fine, it was his thread but it just goes to show the methods some will use to prove their point, regardless how deceitful those methods may be. So yes, I am in the minority but at least MY integrity remains intact.

Fact, our 3.8 motor is more effecient at 1900-2200 rpm than at 2500+ rpm.

Fact, occassional downshifts are not a bad thing, gear hunting is.

Fact, there are occassions where going with less gear works well.

I'm just trying to get people to stop drinking the cool aid and think for themselves.

So again, how's that Hope and Change working out for you since I presume you voted with the masses on that one? Seeing as how thats what the MAJORITY wanted.

 

You should edit the above post to about one sentence and get rid of the political babble, then maybe your opinion would get more backing.

But I agree, your gearing relies heavily on where you live.

 

I had 6sp with 3.73's no 5th gear and 1st gear feels like 2nd gear starts with original 32's. So imagine moving all your gearing down own. I cant get into 6th till around 75-80 and then wont maintain with minimal hills. When I upgraded to 4.88s I think with my set up went a little too far. 4.56s would have been perfect I think. but went from 18-19 mpg to 16-17 mpg. So I didnt really see a huge drop but I get to use my whole trans and it feels more manageable around town and offroad. Highway its a brick with wheels either way but on long highway trips have seen 19-20 and primary use of 6th gear.

 

I'm dumbfounded as to how an apolitical topic can have this inserted into the discussion.

 

I like kool-aid, and hope and change. So I should buy gears right? Sweet can't wait to tell the boss!

 

A 2012 makes a huge difference. More power at lower rpms. There is a gear chart in the FAQ specific to the new pentastar motors and new transmission gear ratios. Speed of interest also makes a big difference as aero drag really starts piling up after 50mph, and the difference between 65 and 70mph is bigger than the 5mph would indicate.

 

You can still push your engine into open loop and be running a rich fuel mixture. Lugging the engine isn't good for efficiency and you can certainly find a medium for not spinning at a such a high rate where you give up efficiency while also not keeping the engine continually loaded up by not spinning at enough rpms.

 

I dropped to about 16.0 on 35" tires with my stock 4.10 gears, and dropped to about 12mpg on 37" tires and stock gears, about 250-260 miles per tank. Rehearing to 5.13 bumped me back to 14.5 to 15 city and about 16-17 hwy at 65-70. Im back to 300-320 miles per tank mix of city/hwy. Manual btw, 37" MTR Kevlars on heavy Raceline beadlocks.

 

JPop's line of thinking is sound.
If the work done remains constant, (in this case, pushing the Jeep at 70 mph is a good example), there is an ideal rpm, above and below which the amount of fuel burned will increase.

The post quoted below bears that out.