Another boring mpg story…
last tank for me was 26.5mpg calculated, with a good amount of 70mph+ freeway driving....
stock slant 6, A833OD, 3.23 with 26.4" tall tires.
best I ever got in the car was in the early 90's on a trip that was all 55mph 2 lane blacktop (25" tires in the back at the time), never going above 60 (had the rear seat folded and the trunk pass through folded and hauling flats of strawberries for the farm market I worked for at the time) got an honest 30mpg