“When you are looking at purely dollars and cents, it doesn’t really make a lot of sense. The Volt isn’t particularly efficient as an electric vehicle and it’s not particularly good as a gas vehicle either in terms of fuel economy,” said David Champion, the senior director of Consumer Reports auto testing center at a meeting with reporters here. “This is going to be a tough sell to the average consumer.”

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The magazine said in its testing in Connecticut during a harsh winter, its Volt is getting 25 to 27 miles on electric power alone.

GM spokesman Greg Martin noted that it’s been an extremely harsh winter — and as a Volt driver he said he’s getting 29-33 miles on electric range. But he noted that in more moderate recent weather, the range jumped to 40 miles on electric range or higher.