Despite what the sticker shows, to get over 20 on the freeway requires a light foot, overinflated tires and a gentle downhill slope.
Okay, truthfully you car get low 20s on flat ground with no wind. You would need to stay between 50 and 60 mph though. These trucks are sorta rounded but still occupy more frontal area than any previous year model. They are heavy too. My 2007 Ram 1500 2wd reg cab is 4940. I have a 75 W200 4wd long bed that weighs the same!