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Just got my XP turbo a few weeks ago. My question is where I live our options for NON-ETHANOL gas is 90 octane and I know technically the turbo calls for 91. Should I run 93 with ethanol or the 90 non ethanol?
 

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Morris Racing #711
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You can run up to 10% ethanol before you would want to have it tuned for ethanol. I wouldn't worry about it, ethanol isn't bad for your engine you just need to be tuned for it if your running a high percentage of it.

If you're concerned that it might have more than 10% you can get a tester from amazon/ebay, they're less than $10 usually, and test the ethanol content in the fuel. I test my fuel all the time, but for opposite reasons, I run E85 so I'm always testing to make sure I have close to 85% in mine.
 

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Ethanol has less BTU, and so less HP and reduced range per tank. More octane than needed also reduces HP and range. Do those things matter to you? Personally I would run 50/50. BTW, you may run hotter on 90. On a turbo I would not run lower than 91.

Now the XPT does have knock detection so I don’t expect you would hurt it short term on 90 either, but I do think egt/cht would both be higher

Just an opinion of course

D
 
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