For the PHEVs, just make sure you're running a full charge if you go driving in the mountains. My Santa Fe PHEV would maintain about 25% battery at all times for acceleration and whatnot during normal driving, but going up Kootenay pass used that 25% in probably the first 10 minutes. Losing the electric engine made it so I didn't even have the power to go the speed limit up the rest of the pass.
On the flip side I did get a 100% recharge coming down the pass in about 35mins
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