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Look up the BSFC charts elsewhere on this forum. You'll see that ~80% load around 2000 RPM is pretty close to the most efficient way to accelerate with most engines. But for steady-state driving on a flat level road, the best economy is attained "as slow as you can stand to go in your highest gear without lugging too badly". Add "with the torque converter locked" if you have an automatic transmission.
-soD
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