I agree with Mr. Bill, your mileage seems a little low. I drive a total of 110 highway miles a day. When I bought my car I drove it at 75mph and got 23mpg. Later, (after a speeding ticket) I slowed down and got 25mpg @ 70mph and 28mpg @ 65mph. Check your tire pressures, waste gate hose, air filter, and look for fuel leaks if you have not already. Good luck.

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'82 300D Turbo 218k miles