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All gasoline engines are most efficient at about 70% to 80% of full throttle. Someone did some tests over at gassavers a year or so ago and found that they got better FE with a brisk acceleration rate as opposed to gradually creeping up to speed. But with an automatic, you're going have problems trying to accelerate at 75% throttle without it running the rpms well above 3000 before it shifts into the next higher gear.
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