Update after 700 miles got 22.4 MPG. 3000-6000 ft (not 8000)Just got 21.5 MPG over 500 miles with 2.7 FP tune, 93 octane, 3000-8000 ft altitude, Rocky mountain highway, approx 7F, 70-75 MPH cruise with some WOT 96+ MPH passing, Blizzak DMV2 at 36 psi.
FP tune helped.
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