Strange concept: unless you've owned an old VW, it'll be new to you

I just learned that pre-80's VW's used the spare tire in the luggage compartment to pressurize the windshield washer fluid. So did 75 Porche 914.

http://www.cartalk.com/content/puzzler/transcripts/200311/answer.html
http://archive.type3.org/archives/1997/december/msg00392.html