We have LPG Gas (Gas as in gas, not gasoline) which I think is the same as the stuff you were talking about Ric. Basically the petrol is used to start the engine and then the gas kicks in, but the only vehicles that are really equipped to use it are minibuses and larger, commercial vehicles. Private vehicles pretty much all run on regular unleaded petrol. If I could afforf a new car I would buy one of the Hybrid vehicles that Honda and Toyaot are making, which run on petrol for freeway driving and times when you need that extra kick, but run on electricity the rest of the time (city driving, etc). I don't know why all cars aren't made like that nowadays. You don't even need to plug them in or anything because the electric motor gets charged as the wheels turn. Also, in England, these vehicles fall into a lower insurance and tax band and are exempt from the Central London Congestion charge. It actually pays to own one of these. But right now I'm poor, so I'll have to stick with my 1985 civic.