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I'm sorry that I can't actually help with your question (never been to Munich) but I am cheekily jumping in to ask my own related question which might be helpful...
I need to get to Salzburg later in June, and direct flight timings don't work so am flying into MUC and then hiring a car. I vaguely recall that there's a highway toll in Austria, but I've always hired within Austria before so the cars came with the ticket. Will a hire car from MUC (Hertz) have the Austrian ticket ? If not, how can I buy one easily ?
Thanks