Native English speaker from Canada here. Although I do see the word auto in titles of shops and such, I don't think I have ever used it in a conversation to mean automobile. Maybe we say things slightly differently, though.
I do.... I'm from Winnipeg, Manitoba, Canada. I'm a native English speaker. I say "spacious" regarding cars. It may be a background difference, as my parents say lots of various words and I read many books as a child.