1981 240D Automatic fuel mileage??

[danton84]

Hey everyone. I recently became the proud new owner of a 1981 240d automatic w/ 138k original miles. Since I got it I have fixed a fuel leak, performed a diesel purge, replaced fuel filters, replaced two faulty glow plugs and adjusted the valves. After all of this and driving between 60-65 mph I am still only getting about 22 mpg. I checked tire pressures to make sure they were all correct and have no other known problems that i believe would cause me to get this kind of mileage. My question is what kind of fuel milege should I be expecting and what else should I check. I would be happy to hit 25 mpg but would like to get closer to 30 mpg if possible. I plan on changing the air filter but it doesn't look too bad and I didn't think it would make that much of a difference. Any feedback/ideas will be much appreciated. I drive about 75 miles a day and want to get the best fuel mileage possible. Thanks, Dane