I can't seem to get my car over 22 mpg. It runs perfectly, has lots of zip, minimal smoke, and hardly burns a drop of oil. It starts right up in the morning and is well maintained. I have been using Red Line catalyst to get this improvement because it was only getting about 18 mpg before. I read in this forum of people getting over 25 mpg and I want to know if this is possible. I don't have a real heavy foot but I do like to zip around. Any input would be nice as I have searched the forum and I still don't know the answer.

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1982 300D Turbo "Helga"
380,000 miles