Garmin Nuvi to display the inner workings of your car

Now this is really cool in a geeky sort of way: Garmin will soon offer EcoRoutes ESP, an optional attachment that you connect to your car's diagnostics port, making it so a selectable screen full of gauges will show up on your Garmin Nuvi GPS screen.

This'll let you keep tabs on lots of things your car is doing that you normally wouldn't be able to see, such as real-time fuel economy, a tachome...