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Like gunpowder, there's only so ,uch energy contained in gasoline. Most of the energy gets thrown away as heat (in both instances). So there's a limit on how much mileage is even possible.
High mileage cars would be little, cramped tinfoil boxes that crept along at 30 mph, carry nothing as cargo and have no "wasteful" options like air conditioning. We could have those - but we wouldn't want 'em for long.
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