Hemp gets better energy value than any of the plants listed above. Henry Ford built a car in the 30's to run on Hempoline. read more about hempoline here
http://www.artistictreasure.com/learnmorecleanair.html . Also the 10% Ethanol won't hurt your car could be BS as some cars do not run well on 10% Ethanol as it causes bad burning and will cause some cars problems and make the "Check Engine" light come on.