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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
on normal everyday driving i average about 16mpg... on highway only if im just cruising and not playin with some rice lol, i can get up to like 23mpg. i get about 200 miles out of about 12.5 gallons of premium.
Between 11.5 and 12.75mpg when I'm just driving around post. When I get out on the highway, I get much better, but I'm rarely out on the highway. I think I would do better if I would hook my emmissions crap back up, and get a new O2 sensor.