if I wanted to get better gas mileage I'd at least put a 289 or 302 in it with a 5speed t5 trans. If you don't like that idea and want something that will get 30mpg, well look no farther than 2.3L or 2.3T, both of those were getting over 30mpg on the highway with 3.55 gears, and I could imagine what those could get in a lighter falcon and 2.73 gears, 40mpg wouldn't be out of reach, oh and 2.3T ran 13.5s at 107mph in an 89 mustang while getting 30mpg
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