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Minimal throttle restriction=maximum efficiency, as long as enrichment is not engaged.
Lower average speeds=maximum efficiency, as long as you can use top gear the most.
Higher speeds are not really less efficient, they require more work to overcome aero drag, that work increasing as the square of speed.
40 mph=1600 units of drag
80 mph=6400 units of drag, not 3600.
regards
mech
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