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I have a similar experience with my M925. Changing the tire size changed the effective final drive ratio to the point that I need to control upshifts and downshifts manually. I only see 5th gear on the interstate.

I have a similar experience with my M925. Changing the tire size changed the effective final drive ratio to the point that I need to control upshifts and downshifts manually. I only see 5th gear on the interstate.

You'd be shocked what you can do for mpg if you go all out. My 1ton pickup truck normally gets 17mpg on a good day, empty, cruising at hwy speeds. (6.7 cummins and 6spd manual transmission) There's a few places in the US where there's a substantial distance between fuel opportunities. Due to...

Consider the following- 1) A diesel engine at idle uses very little fuel. If the engine resistance were the primary energy consumer, then you wouldn't see the fuel consumption drop off so drastically. 2) Towing a high surface area lightweight trailer uses considerably more fuel than towing...

That directly conflicts with my understanding of it. My experience with aero is bicycle related. At 18mph (IIRC) aerodynamics take over from rolling resistance as the primary impedance. (Bicycles...but should be at least somewhat applicable) And from firsthand experience on a motorcycle...