Re: 3 questions
#1 not sure check manual, Try it with the truck on a 40 degree incline facing north 
#2 flat tire icon in the middle above odometer.
#3 You cant see it on display. Go to onstar and register and you will get a report once a month with % remainng(I dont use this because it will have you go 10,000 to 12,000 miles on your oil  .
I also belive you can hit the on star button and they will tell you. 
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H3 gray adventure,brushguard,hood handles,sunroof,steps,crossbows,smokers package,window/sunroof visor,Airbrushed spare tire cover,mudflaps,K&N filter,SS Hummer insert,Hummer rubber mats,cargo rubber mat + shade,12 volt airhorn,eclipse nav/dvd/rear camera/mini remote,autostart,12 volt fridge,high beam garage remote,underhood air compressor, taillight bezels ,clinometer ,trailer brake and hitch.
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