Very interesting, thanks for posting.
Pretty much nailed it for me, the three towns it said 'most similar' are about 30-100 miles away from my 'NW of Chicago' location. I think the key is they ask enough questions to narrow it down. This might get even more accurate if they asked for your location, and fed those responses into a database ('crowd-sourcing' it).
I've always been fascinated by these little differences among us - kitty-corner versus catty-corner, etc. My son was surprised that some of his college buddies called any soft drink 'coke' (or was it 'cola'?), even if it was 7-Up or ginger ale. And he refers to a little mishap as - he did that 'on accident', whereas I would say it happened 'by accident'.
I was a little surprised at some areas that were similar and different from me. Somewhere in the New England area was similar, but somewhere around southern Ohio was very different.
I'd be interested to see a map for each answer combo. I've known of a sandwich with cold cuts as a 'Hero', and I always seemed to be aware of that as a Chicago thing, I know they call them hoagies or submarines elsewhere. I don't think you can get an 'Italian Beef' sandwich outside of the Chicago area. We recently served some for out of town guests, they had never heard of 'giardiniera', which is a key component (pickled veggies, with plenty of hot peppers to give it 'kick'), hmmmmmmmm.
-ERD50