How hard is it to set up and configure ScanGuage, at least as far as getting fuel mileage readings? It occurs to me that if it is easy to set up, then we all should be taking a ScanGuage with us before we buy any car. Before you sign on the dotted line, you could take it for a little drive and see what kind of mileage the car really gets. I'm constantly suprised by the wild differences in mileage people get in their cars. I know driving styles amount to some of the difference, but I have a suspicion that some cars have something wrong with them and just don't quite get as good mileage as other identical models coming off the assembly line. I don't know know if it's a problem with sensors, or what, but I've got to believe that it's more than driving styles.