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WOT is your ecu reporting any knock correction?
Ive had gas stations e85 pump give me e60 and the station right by my house always gives me e74-e75.
Although I just run flex fuel strait no mixing math for me. My tuner did set it to adjust every 1% from 10% to 65%. Ask your tuner how he setup your tune.
That station may just have a winter blend of flex fuel and everything is normal.
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2014 Subaru BRZ
FBM Turbokit: GTX3076R - ECUTEK HRI FlexFuel tune - FBM 3" Turboback Exhaust - 550cc Injectors - Walbro 485 Fuel Pump - 4bar Map Sensor - FBM Oil Pan - ACT SB7-XTSS - AMSOIL all fluids - Forester XT Oil Cooler - Cusco engine, trans mounts - Whiteline rear differential bushings - Perrin shifter bushing - Firehawk 235/45/17 - AEM Failsafe
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