Quote:
Originally Posted by PaleMelanesian
2) coasting in neutral, engine idling;
3) regenerative coasting (hybrid vehicles)
4) regenerative braking (hybrid vehicles)
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I disagree. #3 should be more efficient than #2, under most circumstances. If you are coasting in neutral with the engine idling, you are still using fuel. If you're doing regen, you usually (unless it's cold, when the ECU tries to keep engine temps up) will be in fuel cutoff mode, using no fuel AND getting some charge in the battery.
Of course this may vary depending on terrain, too. Even with full regen, a 6% downgrade will put me over 60 mph.