Above is a map of regional use of generic terms for soft drinks in the US (curiously, 'soft drink' doesn't make the cut). I find the use of 'coke' as a generic term kind of interesting. It's sort of like kleenex, except if you ask for a kleenex nobody is going to complain if you get a Scott tissue instead of a Kimberly-Clark.
"I'll have a coke please"
To see what classifies as 'other', or for Canadian statistics, go here (Massachusetts calls it 'tonic')
[h/t: Gene Expression]