91 10% ethanol or pure 91 gas??

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158
I live in western Colorado at 4500 feet elevation. I have a ZL 1 supercharged with 650 hp and 650 tq. Is the non ethanol better to maximum performance ??
 
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35,728
Give it a try. The sensitivity, the difference between Research and Motor octane, may benefit you.
 
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1,153
I far prefer the PureGas-91 based on all of my research of the damage and lower fuel economy that results from ethanol, not to mention the greater stability of PureGas during periods of storage.
 
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597
Here in Canada, regular is 10% ethanol, mid grade is 5%, and premium has none. Shell around here has this explanation on a sticker on the pump when I went for a fill up.
 
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