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Walker calculated that to keep the place afloat, drivers who spend half an hour plugged in would need to spend 70 percent more than the gas-guzzler who’s gone within five minutes.

The pattern does not hold true, however, for those with the lowest incomes, more than half of whom would continue to be burdened by high transportation costs — defined as more than 4 percent of their income — after trading in their gas-guzzler for an electric car.

The rules apply only to the sales of new cars, so you can keep your gas-guzzler.

My old Prius was no gas-guzzler, but it was beaten up and I was ready for some new wheels.

It exists solely as an auto show car that displays what could be built using Ford’s $4,095 electric crate motor, which makes it easier to convert any old gas-guzzler into an electric car.