I took the test a couple of times. I thought it would be interesting because I have lived in so many places. Born and raised in central Illinois until age 12, then Denver until 18, then NC (Marines), Denver, southern CA (Marines), overseas (Okinawa Japan), Denver, Omaha, Denver, SE WI, Denver, NM, NC, and finally SE MI. I've been exposed to the way a lot of people talk; and some rubbed off on me.
First time, it had me kind of between Illinois and Colorado; it said Madison, WI and Omaha, NE. Well, I lived in Omaha for two years and in Kenosha, WI (close enough to Madison) for six years.
Second time, it put me in Wichita, KS or Albuquerque. Lived in ABQ for two years, but I've only worked a few weeks in Wichita and never lived there. I suspect because I said (the second time) that a submarine sammich is a "po' boy." I didn't have a word for a sub sammich growing up; we never had them. I picked up "Po' Boy" in the Marines. Maybe it's a Wichita term?
Still, I'm a mid-western boy and it shows. We wore tennis shoes (I have never played tennis) and had 'catty-corner' intersections. Supper and Dinner mean the same thing, I say 'merry', 'Mary', and 'marry' the same way, a water cooler is called a water cooler (and not a 'bubbler' as the Wisconsinites call it), and a carbonated drink is a soda.
And I have no word for when it is raining while yet a sunny day.