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Just to chime in here, I have a similar problem with my Wrangler. No, it's not a diesel, but experienced a similar problem. I calibrated it for my daily drive and it seemed pretty good; hit the road for a Jamboree and it was off - whole gallons off! Wheeled all day (low speed, low gear) and the refill was wrong the other way. I think it's using some form of averaging on my vehicle, like your TDI, and is only as accurate as the pattern against which it is calibrated.
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