Just came across this, I'm not sure how old it is but I found it pretty interesting.
http://www.fiat.co.uk/ecodrive/
In a nutshell, its a program you download to your computer that analyzes how you've been driving your Fiat. Data is collected from a usb you connect in the car. Also provides other interesting statics regarding your driving too.
Would be interesting to see more manufacturers implement this into new cars.