Corrected entry: We can see in this episode the Impala has about 70,100 miles on it. This shouldn't be possible if John bought it when he was a teen, drove it, then gave it to Dean who drives it all across the country.
edwardssupernaturalmuggle
1st Aug 2009
Correction: Plausible possibilities are that the odometer doesn't work, or had been replaced at some time *because* it wasn't working. I've had two cars where the odometer either quit working, or only worked intermittently, and they weren't as old as the Impala. Or the odometer only has 5 numbers on it, and rolled over after it hit 99,999 miles.
rswarrior