LOL, sorry, didn't realize not much in the that over there.

 

Okay mr argumentative

As you say, reading is fundamental but so is clarity when writing. You may want to work on that a bit.

 

If you have an auto tranny then yes 5.38's on 37's will vastly improve your mpg's and power. Shit I have 35" KM2's (33.75") with 5.38's and get about 4.5-5 mpg's better than with stock 4.10's.

 

Whoooo are the 35" KM2's only 33.75" in height......?????? need to know this as I get them specially shipped from the states supposingly 35" tire height any thoughts on this?

 

Yea mine measured at 33.75" at 28 psi. BFG's are notorious for being sized small. I didnt know that until I measured for programming my Procal

 

As are every tire out there. Every set of tires I have ever owned has run short and that includes toyos, swampers, goodyears, pro comps...

 

Obviously but BFG's tend to run way smaller then the size shown. I mean my 35's arent even a legit 34".

 

No wonder 37's are the "new" 35's!!! This would explain a lot!!!

O.K. though back to the original post,

How about a 2012 JKU Rubicon with 6spd transmission, stock 4:10's and 37 BFG KM2's? Would my gas mileage improve from re-gearing? I know my low end power will increase.

thanks,
Jacob

 

The 37" KM2's are about 35.5" I believe so I'd say 4.10's or 4.56's would work well for it. Might want to check JPop's new chart for the '12's though to make sure.

 

I'm an 11 with 35s and just installed 5.13 gears. I have seen an increase on average so far of 1 mpg.... Which brings me around 13.5 mpg average.... It could be from me going easy during the break in period but I have only had a tank at 13 or above once before and it was a tank on all highway miles.

I'm happy with the increase... I'll take anything so long as its not a loss.