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How old is your car? Cruise control in every automatic transmission car I've owned (dating back to the 70's) will use enough throttle to downshift the transmission and maintain speed on any freeway hill.

In a manual transmission, then sometimes it needs a downshift and any use of the clutch switches off the cruise control.

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As mentioned in my other comment, 2009 Pontiac Vibe and 2013 Fiat 500. The Pontiac actually has manual windows, so I wouldn't be surprised if other corners were cut for simpler systems..

Interesting all of the minor variations between cars. Both cars (manual transmission) will also shut off cruise control if I even think about pressing the clutch, although rarely the Pontiac will forget to do that until the clutch is disengaged and the engine is revving high. :)

My car has a manual transmission and factory cruise control and using the clutch does not disable the cruise control. The cruise control even rev matches shifts.

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