what kind of tune up can you do to a diesel?

94 300d 2.5t
Trying to get more mpg. Averaging 26.6 now.

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BS wrote:

If it has deteriorated over time, check the obvious, like air filter and trunking. If the milage is high, then maybe the injectors need a service.
Huw
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Move the driver's seat further back ;-)
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