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The thing to remember too is that it really depends on where you drive. Certain areas have better gas than others do. Ethanol does you no favors in terms of MPG. The Frontier I drive every day went from 24 mpg city to 20-21 city when they introduced MTBE's and then replaced them with ethanol blended fuels in my area. 3-4 MPG is a huge difference at the kind of consumption this truck does and is probably closer to 6-8 MPG in your car if you extrapolate the numbers right. My top MPG numbers from my Sentra were from before my area had ethanol blended fuels. It may well be that it would now get nowhere near those numbers today.
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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