I'm smack dab in the middle of Boston, and we say "coke".
Boston and the surrounding area is a toss up. I grew up in Nashua, NH, right on the border of MA, and everyone said "soda". My grandparents, who live in Woburn, MA, a 45 minute drive away, say "tonic". Another 15 minute drive south, and you hit Boston, where I've heard people say "soda," "tonic" and "coke".
However, from what I can tell, "soda" is still more popular in the area.
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