hey justin. just tried the 87 mileage tune over the weekend with some city, but mostly freeway driving. i averaged about 19.7 composite and probably around 22 or 23 on the freeway at 70-80 mph.
i switched back to the 87 perf tune cuz it was more fun, but it seemed to get the same mileage averages on the freeway.
is the 87 mileage tune to increase fuel efficiency at lower speeds/city driving or more for freeway? with this tune, where will i see an mpg increase most? Thanks.