[Caddylackn]

My gas mileage has been steadily creeping down. Every time I refill, I find my Scan Gauge II is off by 10% (used 10% more diesel than gauge estimates). This is with 4 calibrations now. So, four times I corrected the fuel used and recalibrated the Scan gauge

I believe my old injector nozzles are worn out (they are chinese knock offs I bought on Ebay ten years ago). My idle is rough and I was getting black smoke on any moderate acceleration on a hill. I believe my nozzles are leaking fuel, which is why my Scan Gauge is underestimating the amount of fuel used.

I replaced my nozzles this weekend with new Bosio 520 DLC nozzles. Right away my rough idle cleared up and I have much less vibration driving. So I probably had at least one injector leaking. Two were real sooty when I pulled them out. I did not adjust timing or adjust fuel with the Vag COM yet.

I will fill up after the end of the week and recalibrate, again. Hopefully my gas mileage goes up.