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Flex fuel is so awesome. I normally just putt around in my maggie ZL1 on 93. When when I plan to go to the track, I know my car can handle e40 so I use the ecal app on my iphone to get the correct ratio of 93 to e85 to add to get to e40. I also use my HP Tuners setup to be able to log Alcohol content to make sure I hit my e content target. You can also use a plug in OBD2 gauge. Then I rip it, no changing tunes or anything. Then I let that run out, and just keep refilling with 93 and the car gets back to e10 pretty quickly.
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