My 2005 Ram Rumble Bee 5.7, 5 speed auto, stock size tires (20" rims), 3.92 gears, 4X4, 133,*** miles gets 9.25 MPG (hand calculated) city driving with 87 octane. Only mod is a cold air intake, and I use full synthetic oil. I don't do too much highway driving to check that, but last year going...