I've noticed this as well, and not just on the TCH. It happens with older Toyota vehicles that I've driven extensively ('90 Camry, '99 4Runner). Like Barb's Chrysler, the cruise control on a Mercedes is quite accurate even on varied elevation changes. It's also smooth; sometimes I wouldn't notice that the car is accelerating or decelerating to match the set speed.

"Some luck lies in not getting what you thought you wanted but getting what you have, which once you have got it you may be smart enough to see is what you would have wanted had you known."
-Garrison Keillor