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Old 07-19-2009, 06:06 PM   #9 (permalink)
herp derp Apprentice
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i don't think the gains are from premium or octane number, just the fact that you're getting away from the blend. i believe ethanol has about 2/3 the BTU per gallon compared to gasoline. so a 10% blend of ethanol only has about 97% of the energy of regular gas.
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