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From today's Wall Street Journal - A piece of the theoretical vs. actual MPG explanation.

Do EPA Economy Ratings Rely
On Ethanol-Gasoline Fuel?

July 22, 2008; Page D4

Q: Do the mileage figures printed on new car stickers reflect use of ethanol-blended gasoline, the only fuel now available for most or all consumers, or whether the sticker mileage claims are based on using 100% gasoline. If the latter, does the government intend to mandate the use of gasohol to create more realistic mileage numbers?
-- W. Hayes,
Dover, Mass.
[EPA ratings and Ethanol]
Associated Press
The EPA ratings on vehicles like this Toyota Prius are based on ethanol-free fuel

A: The fuel-economy ratings on new-car window stickers are calculated using pure or "straight" gasoline, not the commonly used 10%-ethanol blend called E10. I can't recall the last time I filled up using gasoline that wasn't blended in this way.

Fuel economy decreases by about 2% for vehicles running on E10, so a car rated at 25 miles per gallon will actually travel about 24.5 miles. Of course, the negative effect of blended fuel is tiny compared with the effects of changing one's driving style and keeping the car in top shape. Still, a loss is a loss. While E10, and E15, and may reduce overall oil consumption, it isn't helping individual vehicle fuel economy.
 

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Interesting, nice find!!!:cheers:
 
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