[geezer]

i belive your better off getting a slightly bigger bike. you mentioned hills, not the gz's cup o tea. belive me. 55 up a hill wont happen unless your full throttle and even then a steep hill will require downshifting. the bike is really a pain when hills are concerned. but if you have no issues slowing down up the hills its no biggie. the bike is very underpowered. if you have the option get the savage 650 from suzuki. my coworker owns one and he gets 62mpg avarage. my bike gets 65!
now onto the engine, sure some people think the engine is bullet proof but i have my doubts, especially if your going to flog it up hills all the time. my theory is that most people think its reliable cause they dont own the bike more than a few thousand miles. sure some people have gotten very good milage out of there bikes, like a guy on this forum named blaine. my headgasket is leaking and my bike has 8000 miles on it. O_o its a cheap bike, and if you own one youll know exactly why.
hold on now i forgot about your wieght, you when 50 lbs less than me and are 4 inches shorter. bike might be able to handle you up hills a bit better. and it should fit you pretty well