Hi everyone,
I have posted to other threads about my poor mileage in my 4-speed 240D, but I wanted to make a fresh thread that details what I have done and then asks for suggestions on what to do next.

My mpg averages about 20.

So far:

I have adjusted my driving style so I shift well below the top end.

Replaced all filters, done diesel purge (snake oil) and have been running B100 pretty regularly for about 8 months.

I have fixed the odometer and I have timed it against highway mile markers and on trips along routes that I know the distance. ODO works just fine.

I have replaced all the fuel lines except for the 2 by the tank. These had been replace at some point by the PO. They show no signs of moisture at all.

I have also replaced the braided fuel return lines. I have not replaced the clear lines.

I have done a valve adjustment and checked it again recently.

I replaced all the soft brake lines and confirmed that the wheels spin freely (no brake binding)

I put a 5* offset key on the timing chain sprocket and adjusted the IP delivery. There is still some slack in the chain so it will need to be replaced

I have not adjusted the spring at the banjo bolt on the engine side of the IP.

I have not repaired some of the worn suspension parts (RH tie rod, LH wheel bearing - I think -, steering damper) that make various noises while I drive.

I have not sent my injectors to Sean to have them refurbed with Monarks.

Blow-by on this engine is really minimal. It never smokes at all. The only time I see anything is at night with a car behind me. Then I see smoke that is heaviest at higher RPMs in 2nd gear. High RPMS in anygear provide some smoke, but 2nd is the smokiest for some reason.

So, especially to those with wizard-like knowledge of diesel engines, what should my priority be?

I don't really want to sink the $1000+ into suspension, a new timing chain, and injectors if this won't solve my mileage problem. I have found myself looking at other Mercedes in the want ads lately, thinking about how nice an automatic 300D with turbo would feel on my commute. Feels a little like cheating

If I was to start making these repairs, which should I start with?

I plan to send the injectors out and have the chain done by an indy I think......
Suspension I will do myself....

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT