Bro, Canadas nation population is less than The City Of Los Angeles, they have no one hitting their networks, it'd be the same here if millions werent on AT&T w/ iPhones
EDIT: Looking through my history I see a few 1.8 or 2.7 numbers in there...but a whole lot of 0.5 and 0.7 as well. I still stick by my 1.2 as a normal average.
I have to say that AT&T made good on their promise to improve data speed in NYC. My data speeds have literally tripled and are at least twice as fast as verizon or sprints 3G. I'm getting 4mb down and 2mbs up. I know it's even faster in other places but in my city those speeds are amazing.