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I have used the sensor for over a year on my track dedicated SS 1LE. The "flex fuel" sold locally near me advertises E51-E83, though I have found it to generally be 70-80%. The sensor is awesome and makes it worry free.
The fuel is cheaper, but it will take years to recoup costs, as you need the HP credits, tune, sensor kit, and an O2 sensor/gauge with bung to do it right. For me, it was about the cooler burning fuel on track. A few extra HP at the top of the power band was nice also . . . the power shows itself on long stretches when I'm racing with another stock 1LE on pump 93.
Side note . . . my tuner (Jannetty) told me the stock LT1 doesn't really see any benefit past about E40 anyway.
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