Czech speed limit is 130, but I mostly drive 160 when the traffic allows it. (161 would already be much higher fine and possible loss of license for a year)
No speed limit in Germany. Hence 180 seems reasonable in Škoda Octavia rental.
But most importantly, here in Europe the left lane is for passing only really. From what I understand this law is not enforced in US and everyone drives on whatever lane they like. Then of course you can’t drive fast, that would be suicide.
I was thinking about it but then it turned out that Munich is one big traffic jam. I might do a stop in some smaller place in Germany instead. And maybe take it through Innsbruck on the way back and stay overnight there.
I’m just a bit worried the drive would be too exhausting and that is not good considering that this will be all the holidays I’ll have this year 