(Bloomberg) -- As you may have suspected, your car is spying on you. Fire up a new model and it updates more than 100,000 data points, including rather personal details like the front-seat passenger’s weight. The navigation system tracks every mile and remembers your route to work. The vehicular brain is smart enough to help avoid traffic jams or score parking spaces, and soon will be able to log not only your itineraries but your internet shopping patterns.

The connected car will be a wonderful convenience or an intrusive nightmare, depending on your tolerance. For automakers, it could be a gold mine, which is why the industry is building firewalls to keep the likes of Google Inc. and Apple Inc. at bay -- and hoping to pry you away from their phones and apps when you’re motoring.

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