Those of you running 5.13 gears on your Rubicon, what engine rpm are you turning at 70mph? How about gas mileage?

 

Take a look at the FAQs. There is a chart in there that will tell you the RPMs at 70mph depending on the gearing and tire size.

 

The RPM chart is here:
https://www.jk-forum.com/forums/show...l=1#post211276

 

And be sure to go outside and measure your tires - do not use the mfg's spec.

 

im running 37" km2s on 5.13s and 70 mph nets a whopping 2250 rpms with the aev procal tuner set for 35s , and I might add I average 18.1 mpg thats the math not the gauge.

 

Hey!!! Quick tire question for ya! Ur km2's. How wide are they? 12.5 or 13.5? And is that ur daily driver? :random, sory

 

18.1 mpg! Damnn! That's better than my 07 silverado!

 

18mpg!...Is this with a 6 speed? And a tune set for 35s..does that help to increase mpg r was that a typo?....Thanks

 

Km2 tires measure less than what they are. It may state 35 on the tire but actual size is 33.5 or something like that. So a 37 may be close to 35

 

they are 12.50s and yes it is my daily driver and yes it is less than its just over 35 . and its an auto . I noticed that when I changed from my 35 mud grapplers that are actually 34, to the 37s it was a few weeks before I could change the setting due to a faulty tuner. I actually at one point got close to 22 mpg. I was on a road trip from indiana to oklahoma and my speed was set at just over 60. so play with the setting to get max power and mpgs


PS your speed is the key!!!! 70 will get you around 17.5 to 18 + , go up to 75 or 80 and it drops drastically 13.5 to 14.8