Hi,
ok i know we don't drive a mustang for its fuel economy, i don't care.
2005 Auto, 4.10, 16000 miles old ;p
My Mustang is my Daily, in weekday i took it to go to work.
Usually i was at 20/21 mpg in town. Then one day i changed to an offroad pro chamber (no cats), and my car went to 10/11...