I think we've discussed this on here multiple times. The whole concept of ethanol is absurd, but the way the mandate is written is going to end up effing up a bunch of cars because the ethanol content on a % basis is going to be too high. Read the whole article. Here's my favorite part though:
Less bang for the buck
Ethanol also provides less bang for the buck, since it has a lower energy content than gasoline and therefore generates lower fuel economy. Ethanol usually costs less than gasoline, but AAA estimates that, when adjusted for MPG, ethanol actually costs 15 to 20 cents more per gallon in total fueling costs. So more ethanol in gasoline would lower gas mileage slightly, pushing overall fueling costs up a bit.
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