Joe...

I can't speak for travels in the Rockies, but I've made several trips from Central Oregon over the Cascade Range to the Willamette Valley in Oregon in my '06 FEH. Neither pass I usually use quite approach 6%, but I certainly didn't have any problems keeping road speeds in my rig. The eCVT seems to do well picking the right ratio, and while the RPM's will go up, it's certainly manageable. Just don't watch your Instant Econ...all you can do is think, "Well, what goes up must come down, so I'll make up the MPGs on the downhill side!"