my old 84 tbird 3.8/aod averaged about 19 city and 30hwy, with a high of 36mpg. my 98 taurus wagon gets 20 city and 29hwy. all my inline sixes, both 170s and 200s, averaged 19-21 all the time, it didnt matter if it was my 64 falcon, my old 66 falcon, or my old 80 fairmont wagon. my old 80 fairmont four cylinder did about the same city mpg as the sixes, but actually topped 25 on the highway, except on the grapevine outside LA on interstate 10, then i had to get up that hill at full throttle in second gear at 45mph, and fuel economy as a result suffered badly, i got 16 on that tank. my old 80 pinto 2.3/spd got 21 around town, no highway numbers though as i never got out on the open road with that car. but two V8 cars that i had do disprove the, "smaller engines get better mileage" adage, my 66 mustang 289/3spd got 18 in town and 25 on the road as did my 79 fairmont 302/c4.
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