I just caught the end of Modern Marvels. The show was about sugar. But, it showed how in Brazil. Ethynol is used as the major source of gas for cars. They were able to cut their oil imports from 80% to around 10-15%. I do know we do use it here occasionally. How come it isn't used more?? They did mention that it has a higher combustion rate. Which is why they need a small regular gas tank to use when its cold.