I used to get 22/23 highway with my 123 280 euro with five speed od and 369 rear end.
iirc, 15/16 around town.
I would think that car would get better if a stick. If an automatic it would surely do 20 highway if things were right.
Are you runing stock sized tires? have you checked the odometer against the highway markers?
have you run compression tests?
are you sure you are not dragging a brake?
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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