
My answer? Yes. More like 90% carbonated

In my case, usually, one coffee a day, though my first drink is always a Diet Dew. Then the rest of the day I alternate a caffeinated with decaf soda. Caffeine sodas are Diet Dew or Diet Cherry Pepsi; decaf are Diet A&W Root Beer, Diet 7-Up and Diet Vernor's Ginger Ale (by far the best). If I stop somewhere for fast food, it's a large Diet Pepsi (or Diet Coke if the chain has a Coke deal), with pink lemonade, usually 5:1 ratio. Some other lemonade if pink is not available. If no lemonade at all -- wth!? -- Hawaiin Punch, Orange Crush or whatever other non-cokish, vaguely fruit-flavored, sugar-water is available.
Mostly a Pepsi-product guy now, but spent 20 years as a Diet Coke guy until I burnt out on it. I have a more varied soda diet now. ;)
Prior to working decaf sodas into my rotation -- which I am pretty strict (i.e. pumpkin port) about the sequencing

