Gary brings up a good point - are you in Econ mode? There's a world of difference between that setting and either Sport or Sport+. My default driving mode is Sport and every now and then, I set it to Economy and it drives me nuts. And to be honest, I don't really see a noticeable difference in the gas mileage between those two modes.What mode is the IDS current set? Economy, Normal, Sport, Sport+?
In Economy, you have shift points to get good Economy! (duh!)
As you go up, the engine will wind up more until the next shift. My default is Sport+ (you can set the default)
Try the other settings to see if you have the same experience.