I recently bought a scan gauge, trying to keep better track of my mileage, plus some of the other features are kind of cool. My only concern is the mileage indication while in MDS mode. The scangauge is onlfy indicating around 10-12 mpg while in mds. I figure it must be halving the milage or something, maybe it isnt taking into account the fewer cylinders firing. Just wondering if anyone out there has any insight into this.