I drive like a pissed off teenager smelling of weed & alcohol late for curfew living under the Jackson family household to be beat with a belt ... I still average 21.5 . Once I tried to drive like miss daisy & the shit almost tickled the taint of 30mpg... but then I was bored and said okay byeeeee. Perhaps 02 sensors, a reset of the system, cleaning of TB, IAC, all the hoes'es, MAF etc etc might get you some better results?
basically "re-stage 0" haha