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Old 04-29-2011, 03:35 PM
knightmare1015 knightmare1015 is offline
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Default Re: Does higher octane number give better mpg?

Quote:
Originally Posted by Botta Ranger View Post
Agree on the need to increase CR to take advantage of antiknock property of higher octane fuel. Ethanol simply contains less chemical energy to convert to thermal energy.
Yep. That's why some cars and trucks run better than others off the ethanol gasoline rather than pure gasoline. In most cases though the opposite is usually what happens. Especially with older vehicles.
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