i don't think this has been brought up yet...
the Wave Disc Generator doesn't need valves, pistons, fluids, transmissions, and some other things, which will make a car about a thousand pounds lighter, meaning you won't need so much energy to make it go forward. it is supposedly 3.5 times more efficient than the internal combustion engine.
New engine shakes up auto industry - Technology & science - Innovation - msnbc.com
so...they apparently have the technology. think it will ever actually happen?