ethanol has about 2/3 the energy of petrol.
it isn't really 'eco', CSIRO says from growing the crop to energy out, the benefits are negligible.
also, the govt (ie. us) gives a 38c/L incentive for ethanol which costs 70c/L to make from sugar (petrol is about 35c) - we are losing out on the deal.
People should just drive hachi's and we'd all be ok...