Since the C is 500lbs lighter it will climb hills easier then the other Pii. You can easily go 80+MPH up a mountain or hill! Just apply the throttle fully and it will go no problem! Even if you get 25mpg I guarantee it will be better then any other car under the same conditions.
Im my uphill driving experience, going over the grapevine (4,000ft) no problem but going over pacheco pass in Norcal the car slowed down quite noticeably..