A car like the Chevy Volt and other Plug In Hyrbids liek that will probably the next wave of gas saving cars. Going 50-100 miles without running on a drop of gas is the wave of the future. And if you need to, the engine is only to recharge the batteries, not to power the vehicle. In this case, the engine runs at idle, and consumes much less gasoline, acting like a generator on board.