When I was in Europe recently I noticed all cars are very small, built very light and are diesels. Most are well under 100 hp and get great mileage. That is where we are heading.
A long time ago I used to drive a BMW 320i over there that was converted to propane with only minor carburator modifications. It would run on either propane or gas with a flick of the switch. Now propane isn't cheap anymore either and it fell out of favor.
