That's an interesting observation and I'm not sure how that would happen. So far as I know that car can't see into the future and know that they about to head down a hill or up a hill so you should still be able to easily beat it. Maybe the driver's not, um, as good as he used to be?Maybe it's already incorporating GPS to anticipate hills? JEBar, have a theory based on your observations?
a pure guess at best .... I believe that the computer operating the system changes gears at the optimum point and maintains a steady speed .... the design of the cruise in our Sportchassis is my all time favorite .... when you set the speed, you don't have to reset it until you wish to change it .... get on the interstate, set the speed, pull in to a rest area, shut the truck down, get back in crank her up, get back on the road and hit resume ... it too gets a bit better mileage under cruise than running with out it