Tomnik, I was the other fellow who messed with the fuel elements and had a hard to time adjusting them to get them to match each other, because as you said....as you adjust one, it changes the readings on the others. I got mine all within .3-.5 mV from each other, but I still feel my injection could be better. I am going to wait untill I replace my injectors, ream my glowplug holes (all of the gp's were replaced at the same time less than 4 months ago, but the holes werent reamed), add my new rack dampener pin (dont know if this will do anything) and adjust my valves. I have been meaning to do this for quite some time, but have not been able to do so because of time and money (about to move).

After one full tank since adjusting my fuel elements I have already gotten 2.3 more miles per gallon. This to me seems substantial, especially considering that my mV readings were still more variable than they probably should be. But, still even with that increase I am only getting 22.8 miles per gallon (mixed highway/city), so I obviously have a ways to go. I will examine several fillups and do those repair/maintenance issues before I make any further assesments or adjustments.

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1983 300SD White with Grey interior