Bought some 35/12.5/17 for my 2012 jk. They look awesome, but my mpg dropped from 18 to 14. Anyone have any mods I can do to regain the power and mpg?

 

procal, gear change and downward slope

 

Regear is probably your best option.

 

A 4bt cummins? How bout a sail to mount on the roll bar? Welcome to jeepin my friend

 

I put 34's on my '12 sport and I notice a slight power loss, but nothing I can't deal with. I can still chirp 'em. Some guys regear to regain the lost power, but your mpg will be even worse. Mine went to 17.8 to 15.8 around town and 20.5 to 19 on highway. I can live with that.

 

Your probably getting better MPG than that. Your computer won't read the correct MPG until you adjust it to the correct size tire

 

Procal no question. I went from 19 ish pre-lift to 16. Flashed it with the Procal and I am back up to mid 18's and 19's on the highway.
If you are rolling with 3.21's regearing would seem likely or you are going to really struggle.

 

How are you guys getting 18 and 19 with 35s. I'm lucky to get 15 and I drive really really easy

 

Not really sure exactly. I know having the Procal readjusting for tire size makes a lot of sense. I will say that I am relying on the on board numbers. I have yet to match it to a gps.

 

Same question, I have an 08 JKU and with 35's I get 15mpg. This is with Flashpaq installed with the mileage xp setting.