high 20s basically... depending on driving, you can get anywhere from 22 to 30 on highway. most average around 26mpg.
on good days, my 3rd gen will get 31-32mpg, but on a bad day I'm in the low 20s.. on the track, I get about 6mpg.
the better fuel usage he mentioned above is bacically intended for better fuel burning, reducing in less overall hydrocarbons in the exhaust that the cat most burn up. just another pollotuion reduction measure really.