[jroll]

You don't think other companies are capable of slipping a GPS/3G chip in your vehicle to do the same thing? I don't know what the legality of this would be, but I'm sure they could slide a clause into the pile of documents you sign when buying a car.

The difference with a GM vehicle is that the customer knows the data is being recorded.

[rhizome]

I'm not sure what documents from the manufacturer (and consequently the operator of the GPS hardware/database) you're thinking would need to be signed, but the only stuff I signed when I bought my car was from the dealership and the bank.