Prius Performance On Hills?

[Chris Dance]

I haver never had any problem with four Prius cars I have owned climbing steep hills. eg: Sutton Bank in Yorkshire.

Our son has a Gen 3 Prius and uses it regularly in the French Alps with no problems.

[TonyHSD]

Toyota hybrids can climb any hills that other cars would do, not a problem, the only thing is that they don’t like it where a standard cars don’t mind it, it’s all about the drive trains and how power is delivered to the driving wheels. I don’t mind, even I like the ecvt and don’t want to here about another transmission till I get a full ev if anytime soon. If my auris dies will get another Toyota hybrid, likely. Corolla are great cars. 
Good luck 

[Saxmaniac]

If you look on YouTube for Weber Auto videos the prof there explains HSD in greatest detail and demonstrates with cut away transmissions. The engine spins continuously over a certain road speed to do prevent over revving mg1. It may or may not be providing power, that's decided by the computer 

[Catlover]

The Gen 3 Prius tends to make more revs (like a slipping clutch) but does its job. Gen 4 is much quieter, not a revvy. I have had both.