I'm a bit unsatisfied by the Dealer's response to your dilemma--by the way, welcome to the forum, too. I figure the CVT transmission was just finding the proper rev range for the diving conditions and throttle input, according to the elevation/grade that you were traversing. The high revving may have worried you, since in normal, flat terrain, the revs stay pretty low too, and/but it isn't necessarily a sign of a problem, and I wouldn't worry about it if you have had your CVT fluid changed recently and topped-off at the proper level. The mountains in you area may be steeper and more demanding than what's in my area, but I have actually driven in steep mountains up and down hills with the transmission in "L" low gear, which does send the rev range up a lot higher than normal, but certainly wont hurt the engine (it does, however, sound like it's working much harder with the revs up in the 4,000-5,000 rpm range, but mostly it's because you've probably never let the revs go up that high in normal driving and it's more of something of an adjustment in your own acknowledgement that it's really okay, and not going to blow up or anything like that.) It's possible that I misunderstand your description of the problem, but it sounds like you were saying that the car is running okay, otherwise, and it's just the situation in the mountains that has you worried, even though it wasn't losing power, misfiring, or anything like that, right?