I don't P&G much at all anymore but when I did I went from 55 or 60 down to 25, of course in light or no rural traffic. You'd sure think the big big HUGE gain would come from that extended time of the glide part that is under, say, 50 mph, because the aero loading is so much less per mile traveled. W
Also with peak and min speeds at that wide a spread, a huge percentage of the time was spent with the engine OFF.
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