With English being so widespread language you can't expect everyone to speak the proper queen English. :) Many cultures have spoken it long enough too to develop their own dialects and make some changes. Obviously they felt them needed...
I personally couldn't care less about the petrol/gas etc thing. instead, I would like Americans to pronounce stuff more clearly. So often I hear an American speak only half understandably and usually very fast. So please, open your mouth more and slow down a little bit.