Ford has claimed to invent a new hydraulic hybrid vehicle that is far more efficient than the Toyota Prius. This technology is not new, and was invented in the 1930's. It has been around since then. They were scheduled to start building these in 2008. I guess someone told them not to or else. You can find all the information on the internet to build your own, Here is the article: www.newtechspy.com/articles06/hydraulichybrid.html Good luck. rockhound