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AddChemistry 101: Why battery performance degrades in cold weather

The Ford Fusion Hybrid and its sibling, the Mercury Milan gas-electric, have failed, on numerous occasions when driven in cold weather, to return gas mileage results that match their EPA rating of 41 mpg city/36 highway. Likewise, the Mini E's usable range, when driven by Dr. Lyle Dennis, dropped substantially as the mercury dipped down to 23 degrees Fahrenheit. Heck, even General Motors admits that the Chevy Volt's electric-only range will likely degrade as winter sets in and we're fairly certa

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