I just managed my best fuel mileage ever, from my 05' dodge cummins. I got a whopping 17.5 mpg from a truck with 3.73's, 4X4, DRW, and crew cab. Did I mention that I was limping home to get a new clutch installed after 85K miles? You duramax guys are killing me!
Has anybody here experienced a mileage increase after switching to the larger diameter 19" wheels? I've been told that you could run tractor-trailer tires and save $$ due to their superior tread wear characteristics.