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My local Racetrack decided to run their flex fuel pumps with a 51% ethanol mix instead of the normal E85. What would this flex to 93 mix be instead of the 3.5 gallons that I'm used to mixing at the E85 pumps?
 

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My local Racetrack decided to run their flex fuel pumps with a 51% ethanol mix instead of the normal E85. What would this flex to 93 mix be instead of the 3.5 gallons that I'm used to mixing at the E85 pumps?
With 91 octance I run 6 gallons of E and 6 gallons of 91. (Sadly all we have is 91 in AZ unless you go full race gas)
 

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I use an app on my phone, input what you have already, and what you can pump, then it tells you the ratio for you.

I only fill up right as my fuel light comes on each time, because then it is just a hair over 10 gal that can be put in, so if I put in ten gals even, its pretty much a full tank.

tons of apps to choose from, I use E85 mix calculator.
 
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