So you can't sit at 65 in MDS on flat roads or moderate grades?hi again Dodge Engineers. The service mgr has on four occasions , hooked up the starscan tool to the diagnostic port. then we go on a 15 mile open highway trip. The Evic "gas avg" never goes above 20.5 etc.., on level ground at 55-65 mph the MDs "as verified by the starscan tool" only shows MDS on for about a second then cuts off (this is pretty level ground)..But at 75 to 80mph the MDS (as verified by starscan) stays for for a longer period of time (My car is not a airplane). The gas mileage is what i see on the evic after clearing it to a zero state). I of course check my gas mileage by calculation each fillup. My combined gas mileage since I bought it is:15.34,15.09,15.28,15.99 and 16.62.