There's something weird. My car runs excellent, but is chugging fuel like crazy. 10 to 11 miles per gallon in city. In highway it barely waists any fuel, but in stop and go traffic, it sucks. I floored the car, no black smoke, no engine miss, checked it with timing light and it was perfect at 10 degrees, no check engine light. My dad's old 89' AOD 5.0 bronco waisted two miles per gallon less in the city with 35 inch tires and 4 inch lift kit and 410 gears. Either my fuel guage is not reading perfectly, or my car is running too rich. Now I took it on the expressway and the fuel guage needle didn't move much. 34 miles and it was still at or above full. Does it have to do with the after market Pro-M 75mm mass air meter sensor?