my duster gets about 25mpg combined with a all stock slant6 1bbl, A833OD, and a 3.21 rear with 25" tall tires. beating on it in town I've never gotten worse than 18-19. best highway mileage I've gotten was 32mpg sticking to a constant 60mph.
that's in an all stock '76 A body, I'm guessing the car is 3200-3300 lbs.
1976 Spinnaker White Plymouth Duster, /6 A833OD
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