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Since the injectors are Bosch pintle-style and are 31 years old, they are probably not sealing up too well when closed, and are contributing to the lower mileage you're getting.
But as mentioned by others, there are numerous strikes against you. It IS a boxy sedan style, you have an auto trans, and it is a low compression engine (less efficient). So your mileage is not really out of the norm.
I used to get 23-24 mpg from my stock '73 Ascona (32,000 miles in 1992)with a 4-speed, 3.44, and a Weber 32/36. When I built a high compression 2.0
litre engine for it with a 38 DGAS, a ZF 1:1 5-speed, and a radical cam, I got 22 mpg. More than twice the stock power, but also more efficient, so barely any mileage was lost unless my foot was into the throttle.
Bob
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