Bragging it isn't...I don't think 22 is good when I have to drive on the highway, cruise control set to 70 or less and next to no boosting to get 22MPG. City driving with a fair amount of boosting drops it by almost 10MPG. My 1999 3.2 TL get's aboout 29MPG on the highway and all else concidered, about the same displacement, about the same vehicle weight on the same route and road and the Z should have an aerodynamic advantage over the TL. My wife has been using acetone in her Accord for 2 years for all highway driving and went from 27MPG to about 35MPG but I haven't tried it in the Z given the talk of injector pickiness about fuel.