You can adjust the lie-o-meter. Mine was 6% high orignially and the 21.1 I got above is after I adjusted the multiplier.I do 20 hand calc if I'm keeping it 60ish on mountain roads (21 on lie-o-meter) if I do 70-75 it's 17 mpg. Normal commuting is 17-18 mpg, but that is start, some city, then about 65 for the rest. Lie o meter always reads about 1 mpg higher than hand calc for me. I only run 92 octane.
I got 45mpg from the Utah state line to Cheyenne one time. Of course the wind was blowing about 70mph from the west….I get about 15mpg but I live out west wHere the speed limit is 80 mph which means I’m doing 85-87mph. 70mph I’d get about 18mpg but seeing as how this is the internet, I’ll tell everyone that I get 25 mpg with a headwind and 30 mpg with a tailwind. It’s the internet so everything I’m saying is true…haha