It might be easy to have the calculator spit out a weighted average of your fuel consumption at 35, 45, 55, and 65mph, with a few braking, idling, and hill-climbing events thrown in, and maybe a warm-up period. But to get that weighted average to reflect every individual's actual driving habits? Forget it. Different drivers have different rates of acceleration, cruising speed, and methods of deceleration (DWB / EOC / DFCO down to x mph, regenerative braking, or "leave it in D").
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