Edit: to add value to the conversation: in germany I find googles estimates on long car trips quite accurate. And I'm actually a very erratic driver, sometimes taking every hole in traffic I can to get ahead, just slowing down to speed limit+20km/h where there is a speed trap, sometimes just cruising 80km/h on open autobahn getting overtaken by cargo trucks
FWIW, Advisory speed-limits on autobahn are similar to the western US statutory speed limits (130km/h == 80mi/h). That being said, 200km/h and no other moving violations would quite possibly get you thrown in jail in "The land of the free"
Edit: to add value to the conversation: in germany I find googles estimates on long car trips quite accurate. And I'm actually a very erratic driver, sometimes taking every hole in traffic I can to get ahead, just slowing down to speed limit+20km/h where there is a speed trap, sometimes just cruising 80km/h on open autobahn getting overtaken by cargo trucks