Ok so I did a search and I had no luck. According to fuel economy.gov the average user averages around 20mpg out of their 2000 GP GTP and that would be nice if I could get at least that I get better gas mileage in my GTO in the GTP I am averaging 15.5-16.5 it has new autolite 104s a FWI fresh oild change I just used some Lucas fuel system cleanser I need some help here what else could be causeing me to get such horrible gas mileage?

Thanks
Adam