We would say "Boot","bonnet" and "mate", but interestingly definitely gauge when it comes to shotguns.
"Trunk" is part of a tree and "hood" is something you pull over your head.

We were obviously heavily influenced by the British, however in more recent times American culture has become more common.

But then of course what would I know, I'm just an "Antipodean"!

BTW I also get the "a" and "u" the wrong way round as often as not.