I have 35's on my truck right now. My gas milage took a dump! From 21mpg to 12mpg. I noticed that the ECO mode doesnt go on much any longer.
Heres the real question. Who has 35's and a superchips? I was thinking that just maybe I would be able to change things a bit with a superchip and get some milage back. Any ideas? Last resort before I can the wheels and go with 33's and lighter tires.

 

If you go dowwnhill, and let off the gas, the ECO light might come on......But seriously, you went up 2" in diameter and probably doubled the weight on the tires alone. I don't think it is remotely reasonable to assume that gas milage isn't going to take a big steaming dump.

 

Yeah I agree, I ordered new wheels and tires today.
These in a 20x9


With these coopers in a 33.

That tire is about half the weight and the OD is close to stock.

 

I've been reading truck forums for many years.Diesel and gas.Everyone that goes with big tires and or lifts or both always complain their fuel mileage took a dump.