Ok so after running a few tanks of gas this is my info on mileage, before Procal i was reading 13.6 mpg 2007 2dr with 35's and running an auto with 410 gears, now i am reading 17.79, my rpm's are at 1950 @ 65mph, the procal has helped a lot, although the mileage isnt great it is better, i also have a drop in k&n filter, the speedo is dead on, my mileage and speedo was checked using a fuel app and a handheld gps "not a stock navi", so i would say it did help out and i am happy with putting out the money for it.

 

Will, sounds great... I am still tossing around the idea of 35's but won't have the money to regear for about a year. What gears are you running? What tranny? What year is your JK?

 

Sorry forgot that, 410's

 

I only have an JKU with 3.73's and an auto... so I doubt I would be able to stand it since the area I live in is pretty hilly...

 

its not real flat around here the freeways are but back roads can get hilly, and 95% of the miles i drove on this mileage test were around town and back roads.

 

I get about 15 mpgs in town with my Procal, 5.38 gears and 37's.

 

I'm getting about 15.5 to 16.5 mpg running around town with my 2010 JKU with 3.73 gears, auto trans, and 35's and I live in a hilly area. I also have a ProCal and love it. Speedo is dead on too.

 

The Procal doesnt actually do anything to increase your MPG...Your missing what it actually does....It changes the numbers in the CPU, not adjust for performance...There are elaborate formulas that come up with your mpg based on pre set figures...bigger tires throw a variable in to the equation that needs to be accounted for...basically puts a 10 where there should be a 5 if that makes any sense...

 

This.

Procal ain't a tuner.

 

yeah it changed my numbers from 13.6 to 17.79.