just got my scan gauge on friday, i've been playing around with it a bit over the weekend, but havent had a chance to fully calibrate it yet, because i had to fill up before it arrived
as i've seen so far, the most useful feature would be on the trip, and the current mpg? its what i've been using mostly, i had the misfortune of dog/house sitting in a mostly city area over the entire weekend and my numbers were not great, but in certain areas it seems pretty acurate.