No, that wasn't a factor. Retailers told us it was, but TRU was just robbing us blind. Our price has been pretty much stable since the POTJ days, so whenever that was. The dollar dropped post POTJ and didn't really rise much until after ROTS with no effect on pricing at all. 2002 was when the dollar bottomed out at that 2/3 ratio you mention. We were as much as $0.10 more than the US dollar and there's been no effect on price.
That was the summer I drove through Canada when I left Alaska. Dude, trying to figure out what I was paying in gas with the both the conversion from gallons to liters plus the money conversion! I have a degree in Math and thought my head might explode!