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Got results from the E40 tank. Fuel trim running +3 at cruise, up to +10 city. I can run up to 29.9" MAP at 2500 RPM and 27" at 1500 RPM, although 22" is still the sweet spot. MPG is the same or better than on regular fuel. SG fuel% was dead-on this time, didn't need to adjust.
Had to refill with midgrade 89 E10 because I cut the return trip a little too close with this tank. This brings the tank E% to 24%. Strangely enough, the return trip reported worse MPG with a tailwind. Not sure if this is just because SG has been calibrated to the increasing E% in the fuel, but I did notice higher MAP required to maintain cruising speed on E24 than on E40. Interesting...
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