Many car owners probably have not yet realized that their new cars are already equipped with blackbox systems which have lots of sensors and log many operations executed by the driver.
The question here is, who is actually "watching" you.
According to TCS (Touring Club Schweiz) there are reported cases where car owners lost their warranty claim just because the manufacturer could prove they have stressed the motor by driving in a suboptimal gear.
Source: Tagesanzeiger, March 11, 2010
Direct link: Wer ein neues Auto fährt, kann nichts verbergen