My ZTT is perfect on cruise but as others have said I have felt the sensation you are talking about on other makes of cars, it is usually on Turbo cars especially if they have been tweaked.
The worse one I had was a Saab 9000 Aero, tweaked to about 300bhp and the cruise was almost unusable, below 60mph it was acceptable but anything above that and even passengers were complaining after a few miles.
Does the Cruise get its speed input from the same source as the speedo on these cars? I know on some makes they use a different ABS Sensor for cruise than the speedo.
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