Hey guys, I recently just bought a 06 Mustang GT not too long ago. The car already came with many modifications, currently right now this is what the car has... Has Custom Grind Comp Cam, (I do not know what size) JLT Cold Air Intake, Mac LongTube Headers, BBK Twin 62mm Throttle Body, X-Pipe and Racing Series MagnaFlow mufflers. The car runs perfectly fine, as of right now their has been no problems with the car but the car just wastes a ton of gas, driving around town, the car is at about...

Need HELP with extremely poor milage!