In my 83 240d with the 300d euro motor, 307 diff and five speed overdrive tranny I can get 35 with ease. With the 23 gallon turbodiesel tank I can exceed 750 miles on a tank with no sweat.
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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.