New Cars Leave MPG Standard Behind

New Cars Leave MPG Standard Behind

General Motors promises its forthcoming Volt hybrid electric car will push fuel-economy levels to new heights. It also could spark an overhaul of the miles-per-gallon standard, a number that doesn't tell consumers enough about the next generation of vehicles.

In recent weeks, GM has touted the Chevrolet Volt's expected 230 mpg fuel economy in city driving. The big number dwarfs the mileage of any car on dealer lots.

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