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Anyone who is savvy enough can find someone to reprogram even an electronic speedo and ECU. This has been talked about on the forum a few times for legit reasons (adding aftermerket cluster and/or hud).
Honestly, I don't look at mileage nearly as much as I look for abuse or other signs of wear. My car had 99k on it when I bought it, but still had orig clutch, and lots of TSB stickers all over it. I preferred that over some of the other "low mileage" cars that were already on a second clutch at 50k mi and had lots of creaks and rattles. Use common sense, if it looks beat...it probably is, regardless of mileage.....just move on to the next one.