'92 300D fuel economy expectations

I'm averaging ~28mpg doing typical real estate biz driving; suburban, not much freeway. I've heard stories of 35-40 mpg, is that a bunch of hot air or do I have room for improvement?
JD
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You are on the average... There is some room for improvement but that would require some work and money... such as the fuel injectors... change out to rebuilt unit or rebuild it would yield good improvement.
Some Startron in the fuel tank would be good to kill off algae that is growing inside the tank...
Injector timing and timing chain inspection as part of tuneup helps too... depending on the mileage you have on the engine... timing chain need to be replaced for optimal performance and safety.
Lastly, turbo banjo bolt need to be cleaned... make sure turbo is functioning properly.
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Tiger wrote:

Thanks! Does anyone do extra precise injector rebuilds better than the factory ones? I know I have some choices with my TDI but MB doesn't seem to attract much in the way of aftermarket performance stuff.
I started using Startron a month ago in addition to the Redline I dose it with at every fillup. Seems to make a difference.
225,000 miles. I'm probably due for a timing chain. My MB trained indy mech isn't too concerned about it and she runs pretty strong.
Again, Thanks!
JD
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wrote:

if it ain't broke don't fix it. those timing chains can be a real pain to deal with __________________________________________ Never argue with an idiot. They'll drag you down to their level and beat you with experience.
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jdoe wrote:

So I've heard but I've seen a friend of mine snake a new chain from the top without removing the front cover. Apparently it takes a deft touch that only busting a flat rate manual will teach you to do.
JD
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Diesel injector wear out because it is under extreme pressure so 225,000 miles will wear it out. The spray pattern is not as optimal as a rebuilt one.
As far as timing chain goes... if it breaks, you are in real trouble.... so it is a preventive maintenance thing and you are right on the shortcut method.
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On Tue, 27 Nov 2007 16:22:16 -0500, Tiger wrote:

Is this engine an interferance design? In other words, if the timing chain breaks, are you going to be bending valves and possibly holing a piston?
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wrote:

you would only see mileage like that on prolonged highway runs, I managed 39.5 mpg @ an average speed of 70 mph on a recent drive from NJ to FL, I probably couldn' ve done better if I slowed down a bit , 2005 e320 cdi __________________________________________ Never argue with an idiot. They'll drag you down to their level and beat you with experience.
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