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Originally Posted by 78w72
thats very true. but what happens when you increase the volume of ethanol to compensate for the lower BTU? i have never had an engine set up for that but i know some people that do & most say ethanol has some benefits like cooler & cleaner burning etc. for high compression or turbo/forced induction engines the higher octane E85 is what lots of guys use. plus its cheaper than any comparable octane fuel.
as you mentioned, i have never really noticed a difference in 91 straight gas vs 93 with 10%E in 3 different pontiac engine cars, the higher HP one at the drag strip or driving any of them around town. i try to stick with straight 91 but will get the 89 or 93 ethanol if its cheaper.
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Mikes Reply:
Living in south Florida on a cool night in the winter the 1967 428 HO loves the higher 93 octane with 10 % Alcohol but the next day it is 90 degrees and the Alcohol takes affect and starts vapor lock issues. Then I have to go to the Rec- 89-90 fuel, less Alcohol.