How many miles a Chevrolet Volt can travel on a single gallon of gas is still up for debate. The EPA rejected the formula that General Motors used to calculate its 230 mpg estimate for the extended range vehicle. In GM's defense, it used a draft formula that the EPA developed for testing plug-in hybrid vehicles.
Using those calculations, GM has been promoting a 40-mile range on a single charge of the battery when driving the Volt in EV mode. Yet when using its gasoline-powered engine generator to propel the vehicle, the Volt would be able to extend its … Read more