Fuel is expensive here, however, cars that running on gas,(like cooking gas) are getting more and more popular here, in fact, all the taxi run on gas by law. and there are like 1 mil' taxi in Bangkok alone
Its very cheap, you can fill up a whole tank for about $15 and it last almost as much as a tank full of fuel will. Does not dammage the car's speed.
You can install the system on almost ANY Japanese car, cost about $2000 to do it, a funny price compare to what you will save..
I was just visiting the US, most of the ppl there does not even know about this option... I sure hope the next president was ever in Bangkok...
It could really help with the US economics.