Miles per hour? Depends on how much you use your right foot. For an average miles per gallon, probably about 11 to 15 mpg. Also depends on the motor, pretty sure for that year that there were two V8's, the 305 and the 350. It being an '85, that means its carburated which brings mileage down a little further I believe.
yeah i got an 83 and with the way i drive i get about 8 mpg's, but then again, i bet the supercharger doesnt help ;)
Yeah I mean mpg my mistake but thanks for still figuring it out and giving me an answer