Not sure about
everybody having a vehicle... Chicago is a big, busy, bustling place and a lot of people take the El (elevated train/subway) or other modes of public transport to get around (cuz it's usually quicker and cheaper - parking costs a fortune in Chicago!!!).
Gotta go with the GMs ruling on that, of course...
For the record, I don't imagine Murph's vehicle being much of anything... probably some rattle trap clunker of a compact truck or some such (mechanics usually drive the worst cars on the lot if you've ever noticed) and likely wouldn't fit all of our group comfortably inside... *shrug*
C'mon... you know everybody wants to walk to Wrigley, anyway.