The RVP is based on a test that measures vapor pressure of the gasoline blend at 100 degrees F.

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Although heaters are minimized to conserve battery range, Consumer Reports rated a Volt test car at a paltry average 25 miles of electric-only running before the gasoline engine kicked in under cold Connecticut winter conditions.

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Ethanol subsidies began decades ago as a small test to see if corn could produce a fuel that would be an appropriate substitute for gasoline.

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