Also, the "other" sections of Connecticut and Western Massachusetts on the sub/hoagie debate is likely because they call them grinders.
Massachusetts' east/west divide is pretty interesting in my personal experience of being a Western MA transplant to Eastern MA — it's such a strong divide for a little state.
I've been finding regional food differences pretty interesting in the past few years. For example, many pizza places in Western MA make rectangle pizzas (similar to what you'd see as a very large catered pizza)... and a "combination" pizza is a somewhat standard amalgamation of hamburger, onions, peppers, and pepperoni.
In Eastern MA (or in most other places) I've yet to find a rectangle pizza, and if you order a "combination" and they'll asking you "a combination of what?".