aroud 225 > 250... but I do NOT drive very gas mileage conciously... hehe. I like to let me turbos spool... hehe. I've gotten 345 miles once driving on the highway at 80mph... But then I'm still not being very mileage concious... So. I'm sure I'd get a lot better if I kept it under 3krpms. But my Z also smells EXTREMELY rich... so, go figure.