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I would assume this is the 83 300D. Check to make sure the throttle linkages are all tight, so any throttle input is not wasted by loose connections. If you have loose linkages, you'll have to step on it more to get the same power.
On the 83 there's a nut that usually becomes loose on the throttle linkages. Follow the rod from the firewall forward til the end of that rod, and near that would be a 10mm nut. If it's loose, that's your culprit. There should be no play and that nut should be on tight. Loosen it, and pull the throttle linkage towards you as if to accelerate the engine. Then make sure the nut is on the leftmost part of the bracket (assuming left is the driverside). Then tighten that nut and hopefully you'll get the power back and better MPG. I've had this problem before and I too got 22mpg. Tightened it and it went back to 25. Goodluck!
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