Just wondering what others here are seeing for mileage. I have about 1700 miles on the clock now and have an average of 15.7 MPG. I drive about 50 miles per day of which probably 40 of that is highway at 75-85 mph. I undestand that I shouldn't expect much from a 550 h.p. car but 15.7 seems kind of crappy. Have any of you guys with mods noticed any increase in MPG?