I just used it as an example plus u can grow as much and regrow it. Honda's nitrogen cars are awesome also. Then there is propane methane etc etc etc... a couple years ago a guy desinged a mustang that had 500 hp and gor like 80mpg on his own designed motor he won and low and behold never heard anymore about it.....
This isn't the same one i am talking about but
http://www.hp2g.com/articles.html