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To: Ish who wrote (6832)	1/3/2007 7:56:28 PM
From: Maurice Winn	Respond to of 6901

Ethanol has high octane number so perhaps the octane number of the fuel the co-op used as 10% ethanol had a higher octane number than the comparison fuel. Also, the octane number test method matters too. If research octane number [R] was used instead of a combination of motor octane number [M] and R, then the results could be different by that amount. [R+M]/2 is often used to define octane rating, but sometimes other ways of defining octane rating are used. If you take 91 [R+M]/2 and put 10% ethanol in it, you will get a higher octane fuel which will give better performance in a particular engine which can use high octane fuel, but I forget the fuel consumption and performance improvements which we got in 1980s vehicles. Oil companies run extensive test programmes to see what performance and fuel economy they get in a range of vehicles, for different fuels, as well as effects of wear, emissions, engine deposits, effects on lubricants. Mqurice