It just doesn't seem normal to me, sure maybe a long hard pass, but a short one? I've owned a lot of diesels, I have a 2012 VW Jetta TDI that never moves off or the middle of the gauge no matter the grade, and I don't slow down.

Even the brown car that was the donor for this car and how I got the manual transmission, it never moved off of the 80 degree mark, no matter how much you pushed it. Of course it was an NA diesel too though.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.