How many miles a year would be typical for a high mileage car? This guy took it to the extreme.
I believe taxis are used as a kind of canary in the coal mine for some cars. Obviously, this is limited to those in the market for the same models used as cabs, but these purchasers often tend to be fleet buyers (eg. the Ford Falcon is a common taxi here in Sydney, and also liked by corporate buyers). Taxis run up enough mileage quickly that they can get to start showing potential problems within the year they were built, that other buyers might have to wait a decade to discover. 6 - 12 month old taxis are watched carefully by the industry and by buyers.