The few available range-extended electric car models give drivers added flexibility by using gasoline engines as onboard backup generators.
But using the range extender too often may consume a significant quantity of gasoline, somewhat offsetting the purpose of owning an electric car for some buyers.
Electric-car advocate Tom Moloughney faced that dilemma about two years ago, when he decided to buy one of the first BMW i3 electric cars in the U.S.
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