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Old 12-05-2019, 03:37 PM   #13
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region: RMIC
Location: Colorado
2016 WRX


FWIW the pump probably already has E10 as the fuel, so putting 3 gal of E85 is putting you closer to E25 than E10. Watch your 1) fuel trims, though those will probably decrease, and 2) watch your AFR, make sure it doesnt get too lean. Ethanol takes more fuel to reach the same stoich, so your AFR will lean out the more ethanol you use because you are scaled for a different fuel. Stick with 1.5 gal, if that doesnt work consider getting a custom E Tune.
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