i was under the impression the ngauge wasn't very accurate. when I uploaded tune revision(same e85 in the tank) the number read above 90 right then, and the rest of the time i had that tune. tested at 77%
i was told it wasn't important in the FF tune because it could adjust, but for those with forced induction this might not cut it
Bought the little test tube kit. I bought a small toolbox and now have a little "test kit" in the trunk. Small plastic measuring cup, bottle of water and the test tube.