I have had my '84 300D for about a year now and have never gotten very good gas mileage. I have tried just about everything imaginable to rectify this, to no avail. I have repalced fuel filters, air filter, tried diesel additives, adjusted valves... Every now and then I will get 21mpg on the highway, but most of the time I get around 19-20mpg. Driving daily on the freeways, it is much worse. Any further advise to raise it up a little would be appreciated.

Mike

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Mike

'80 300D
'84 300D
'85 300D
'87 300D