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This is a fun contest of coasting ability, which is road load divided by mass:
m*a=.5*CdA*ρ*Vē+m*Crr*V
Winner has the lowest a.
At very low speeds, where I've won gravity-powered races against a coworker's '59 Plymouth and completely dominated his '64 Ford, it's strictly a contest of Crr.
When I first got the Insight, I was expecting it to coast forever. But it turns out, the Subaru coasts just as well due to its 50% higher mass and 50% higher road load.
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