What kind of gas mileage does a 1977 Ford Maverick straight 6 get?

I am looking at purchasing a 1977 Ford Maverick straight 6 43K body is in fairly good condition. Would like to know what kind of gas mileage it gets. The car is $2500. Good deal?|||if the engine is a 200, you may get 26mpg on a straight highway stretch, if the engine is a 250 might be 23mpg highway stretch, all depends if it runs good, standard/automatic transmission, I had a 76 Comet, which is the same|||Im guessing about 12 to 14. the cars made in the seventies were not to fuel efficient.|||Well tuned 18-20