re: Fuel test: 10 gallons of E85 today in my Tahoe..

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Yeah, you don't understand how this works. E85 doesn't provide any power boost. It allows one to retune and use more aggressive timing and a:f to boost power.

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A "flex fuel" vehicle has an inline sensor that allows the ECU to read alcohol content of the fuel. The ECU then adjusts timing/AtF accordingly, and then will retard based off knock sensor readings.
There is a small bump in power, but for a stock NA tahoe I doubt it's very noticeable.