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Not controversial at all.
Many have found brisk acceleration to be most efficient; not "punching" it, but about 80% throttle. Some of the reasons for that are engines are most efficiently converting fuel to work at near wide open throttle BUT go too near WOT and fuel enrichment systems get activated thus reducing fuel efficiency.
This works best on m/t cars; with a/t cars one has to let up on the gas a bit so that upshifts can occur at lower rpms.
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