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The EPA is mulling an investigation into whether raising the octane rating on standard gasoline might be the right move for the environment. A figure as high as 95 octane could be possible to make modern, downsized engines more efficient.

Current Owners Told GM To Change Pricey Requirement

Buried in the new technical details of the 2016 Chevy Volt released yesterday was a throwaway line about a small but important change that's due to the new 1.5-liter, four-cylinder engine. The first-gen Volt has always required premium gas but the new powerplant will be happy burning plain old regular.

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