When I think about automobile GPS devices, I genereally think about a device that talks to satellites to tell me where I am. The...

Garmin ecoRoute

...download add-in is compatible with the nuvi 205, 705, 1200, and 1300 series GPS and says it provides routes that conserve money and fuel.

CNET, however, tells us there is one more interesting wrinkle in the form of the ecoRoute ESP module. This is an additional piece of hardware that connects to the ODB-II diagnostic port available in most current generation cars. This module gets information about vehicle performance from that port and sends this data wirelessly over Bluetooth to a compatible Garmin nuvi GPS...

Garmin communicates with your car via ESP

It is not available yet. But, I imagine even non-car-geeks are salivating over the prospect of getting this ecoRoute ESP product. I know I am.