Number 3: Don't Buy a Car with GPS

First of all, Big Brother will be able to track you down when you finally go ahead and pull that Thelma and Louise stunt you've been dreaming about for 15 years. Second, it's a waste of money: buy a portable navigation unit – they're often better and can be switched from car to car. Most of all, it makes absolutely no sense to add more than a thousand dollars to your car purchase when you can buy a TomTom or Garmin at a fraction of the cost. Here's a good review of the best available portable GPS systems.

Photo credit: Oliver Bentley