this is pretty interesting! My mum has a AU fairmont, and on a long open drive she wound that up to around 187 km/h, according to the speedo, I told her to slow down because she is a maniac of a driver, so i dont know if it could have kept on going...
I dont know if the car was on cruise or not, and the speedo may have been out, but the car was only about a year old when it happened, so i doubt the speedo could be that far out (it was still rising steadily). It is interesting though... but that is definately what the speedo reckons... maybe a bug like you said??
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