I have an '02 excursion with 35" BFG all terrains (315/75-16). I'm chipped and getting 15.5 mpg. I'm thinking of going back to stock tire size if I can get a significant enough mpg gain. Would anyone know approx how much if any gain I could expect?
just remember guys with over sized tires you are really traveling farther then it shows on the odometer unless you have it corrected with truespeed or superchips etc...
I know my truck is out 6 km/h or 3.8 mph so on a 100km I have really traveled 106km and I'm only running 33's vs the stock 31's you have 35's you will be out more.. gps it that's how I checked it out, and then compared a trip that we made with my truck and over sized tires and my wife's Monte SS with stock tires ... she followed me from the drive way to the cottage up north so we went the same distance but mine was clocking less miles/kilometers then hers.
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