I've driven mine about 120,000 miles in the past year. Just a random sampling from my log shows right at 25.1 actual and 26.3 shown on the digital display. That's about 80-90% highway but here in eastern KY that's also a lot of ups and downs. Mostly driving at 65-75 MPH. It's a 2007 supercharged Grand Pricks. Great car but at 180,000 miles it's ready for front hubs, tie rod ends and rear shocks. Going to do it this weekend and get it aligned before the winter tires go on. It's got to be reliable hauling drugs all over Kentucky. I do work as a narcotics delivery guy for a pharmacy and not some Colombian drug lord.