I just calculated my MPG over 70 miles. I drove as I normally would as to get an accurate reading. There was some city driving, some highway stop and go, and mostly highway with cruise control on. I have an intake, 3" DP to 3.5 to 4" exhaust, and a chip. I have been known to have a lead foot, but still expected a bit better mileage. Is this accurate to my driving habits, or is there something I can do to get better mileage?