None - because its still an insanely inefficient liquid fuel controlled by people OTHER than us and our cars are STILL not designed to run on it and I am NOT buying a new car. (talk about a waste of money)
Ethanol is not relevant ecologically in the LONG RUN because we physically can not make enough to even DENT our total usage. Not even close.
The solution is electric. This free's us from those that control the "fuel" at the "pump" and free's us to generate power by ANY MEANS WE CAN DISCOVER
a gas engine can only run on gas but an electric engine runs on electricity and you can make electricity from damned near anything.
owe and the 89% efficiency is pretty bad ass too.
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