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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.
lets face it, gas mileage for a 5.0 is like tryin to find 2 finger prints on 2 different ppl that are the same. no mustang will have exactly the same because of so many factors. Ie. weather, motor, gears, driver.... the list goes on
Try here................www.fueleconomy.gov I get 15-17 mpg city when i'm easy on it, and conditions are good. Highway I get right about 27mpg w/3.90's. Mustangs get better highway miles because of the higher speeds at lower rpm's, as long as you dont go too fast then you're gonna start burning fuel more quickly. My sweetspot on the highway is 60-70mph I get great gas mileage in that range since I'm only at 2000rpm's approx.