Did you run a carfax? Maybe there will be a mileage report somewhere in there; it would almost be worth it to call the salesman's bluff. Carfax is free at the moment, you know; did you see that thread?

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)