I recently installed 35 tires and immediately noticed a decline in MPG (from 13 to 11.2 to be exact). Of course I knew this and accepted it. I've had a Edge Evo for a few years but always left in level 2 without any other changes in settings. So, I got the programmer out again and started changing the torque converter settings and got my MPG back to around 12.

I had recently ordered a Troyer efan kit but never got around to installing it since its been like an oven here in Texas. I finally installed it and wow what a difference. The air is ice cold even at a stop (main reason I wanted to convert to efans). The throttle response is a little better but nothing great. But my MPG is now at 14.3 (calculated manually). Granted I'm only on my second tank, but it seems to be true. Getting 360 miles from a tank full is sweet, I hate getting gas

 

Outta curiosity how much was that Efan? Was It an easy installation?

 

ive got an 06 fx4 running 35s with the stock 3.73 gears. im also seeing 14-15 mpg on my truck as well. ive got the 2010 efans along with a gryphon programmer running the tow tune. i drive mostly hwy. all manual calculations as well and the speedo dead on with my gps. its great seeing the mid to upper 300s per tank!

 

The fans were $429 from Troyer and it took me about 6 hours to install. That time was including the breaks I had to take due to the rain. Maybe 4 hours total. Very simple job to do, dressing the wiring up was the hardest part.

 

I'm running 3.73's as well. It's a great improvement, I couldn't be happier or more surprised.