Having just driven from WV to SC and back across Appalachia over the past few days I highly recommend cruise control to take the guess-work out of mountain climbing. I had ECON off and A/C on most of the time through the mountains. I'd turn ECON back on going through slow sections.
4 people and the hatch loaded down with stuff blocking the rear window and I had no problem maintaining speed and passed 90% of the cars I encountered and got from 'West' West Virginia to South Carolina on 1 tank of gas, about 44 estimated MPG by the time I got down to the state line.
Say I had cruise set for 75 MPH, it would dip down to 72 and climb up to 76 and generally stay at about 75 the rest of the way up. The car does have a competent cruise system.
What I found was if I did it myself w/o cruise, my RPM's were generally higher. If I let cruise do the work itself, my RPM's were a little lower. Still high regardless in like 4 to 5 K territory, but I don't recall 6k being reached.
I had to get in the slow lane to get around some cars. Every time I verbally noted "That has got to suck being passed by a hybrid in the slow lane."
Fortunately I never had a regen occur going up the mountains. The car seems to know it shouldn't sap engine juice under high RPM situations.
Another thing I noticed is that it would not go into full regen even with touching your brake pedal -- I suspect the car was aware the battery pack was hot and didn't want to fry the cells with too much electricity. After parking and the car cooling down it would allow full recharge afterward. Speculation but that's my best guess.
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