Now this has a couple of possibilities most people love a nice cup of coffee in the morning to get them going, but it is not that we are talking about. It seems that coffee not only produces a kick start in the morning it can also produce a very fine bio diesel too.
The good thing about this method of producing bio diesel is that it actually takes place after the coffee has been used. This means that all of those coffee shops around the world could be sitting on a potential gold mine as it is the oil that the grounds contain that can be used, you have to wonder though, does the exhaust smell like the inside of Starbucks?
Source [Auto Blog Green]