Someone actually spent a lot of time to figure out (and chart/map) what common slang term for carbonated beverages is used, by locale, in the US.  What do you call them in your area?  (There is no chart/map for the Canada.)  I know there are many Canadians on this site; What terms do you guys use?     
What other names can you think of?  Pop, Soda, Suds, (I think suds is slang for beer).   
http://i.imgur.com/rlwJ2.gif   
I drink Walmart brand caffeine free diet cola, but I ask my wife to "Please bring me a "coke"."   
As I ride around the country, I want to "speak the language" of the locals.     
It always amazes me when I'm in a restaurant and ask for a diet coke and they tell me, "We have Pepsi; Is that okay?"...  I wonder how many people actually say "Oh, no.  I don't like Pepsi".  I'm not saying they don't taste a little bit different from each other, but seriously....   
Bonus question...Who sells more Coke than The Coca Cola company?