That does seem odd. I do know that as soon as you turn off cruise control the throttle releases....because nothing is trying to keep the car accelerating anymore and that is the same with every car I have owned. Also, when you set the cruise control during any period of deceleration, they throttle will increase because it needs to in order to maintain the speed at which you pressed the button and stop the deceleration. However, if you are seeing revs increase without speed increasing, that is odd. Basic mechanics would tell you that if the engine revs increase, that is more power to the transmission which would result in increased speed assuming no changes to drag(wind) or incline in the road.
I have not experienced what you are saying, but have experienced issues like you describe but are explained by other outside factors (hills, wind, setting during deceleration etc.)
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