I think I can, occassionally, feel it. Kind of like you ran over a single piece of gravel.
Going to 4 cyl, also seems to increase the rpm from 1800 to 1950, which and increase in rpm would make sense. With 4 cyl, you should have the power of a 165 HP engine (half of a 330). Hence increase the rpm to give the same power.
With cruise control and going down hill, as the Jeep seems to be in free fall (almost no engine/drive train, friction), you seem to go to 8 cyl mode, and then downshift to 4th gear. It's trying to keep your Jeep at the preset speed, but it is also bad for the gas mileage. I was upset about that, until I saw the radar at the bottom of the hill <G>.
I would like an idiot light, even if it is aftermarket to tell me when MDS is off or on. Other Chrysler vehicles have it.
Tom
Limited with MDS