lol Ian, yes, does sound improbable doesn't it .... but he only kept his cars for 18 months max, then px'd them at the dealers for a new car, hence keeping the recorded mileage low.
it does remind me of a guy i worked with in the RAF, very keen on sports cars, bought himself a nice looking MGB, when he came to sell it he removed the speedo, bought it into the instrument workshop to open it up and 'adjust' the odometer ..... on opening it he found a scrap of paper inside, on which was written ... 'oh no, not again' ......