obi: Wow! Yours is *really* bad.

Mine does get exponentially worse, but not quite as big a variance of 10mph+. Like I said, on average, 55mph = 61, 65 = 72, and 75 = 83.

Yet, on the slower speeds, it's pretty much dead-on. I guess this could kinda explain the poor gas mileage that I've been getting.. my odometer is probably off by a few miles! Okay, it isn't exactly "poor" mileage, but I'd rather get 28-30 highway, than the crappy 23-25 that I get right now. Probably doesn't help that I have a lead foot, and the car has no turbo / a non properly-functioning turbo.

Anybody have a way to fix this speedo issue?

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]