[getnpsi]

I came up with an idea, and dont know how to implement it, but i think it would be a good idea for those super mileage geeks. How about running a lead from the scanguage to the rear of the car with a large digital readout for instant/avg mpg for all to see? maybe with a advertisement for this site? If they can be produced cheaply, some sort of donation on purchase to the site?