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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.
Mods in my signature, interstate (75mph) and in town (80% of the time doing about 55) I get anywhere from 200-240 miles per tank. Whether I'm getting on it or not it always stays in that area, I used to get around 300 miles to the tank when I was stock (with exhaust). Using 91 octane and 16 degrees of timing did recently (past week and a half) increase my gas mileage dramatically, I'll let you guys know how much I'm getting when I run a full couple of tanks through it.