I live in a dark red/maroon county. (Highest % Coke) Though I call it soda myself... everyone else around here calls it a coke.
p.s. I don't know why you all have so much of a problem with the 'coke' thing... If you are out eating, you'd just ask for a sprite or whatever you wanted to drink... it's very rare that you'd say a coke and they'd ask "what kind?"
People just say coke in the same way I would say soda... "I'm going to the vending machine to grab a coke... would you like one?" Similarly, you wouldn't go out to eat and tell your waitress you wanted a "soda" or a "pop" and expect her to know wtf you are talking about...
As to Mishelle... lol! I do say fountain drink if I'm at a place that you have to fill your own beverage... It is the most accurate term.