Le mardi 12 mars 2019 05:14:15 UTC+1, Tom BravoMike a écritÂ*:
On Monday, March 11, 2019 at 8:27:57 PM UTC-5, wrote:

(…)
For all you hear about the "Autobahn," remember that it is regulated quite severely as to what vehicles are allowed, and the total length is only 12,996 km (2017). The US Interstate system reaches 77,840 km (2016) with speed limits from 65-85 MPH. (…)

The length you quote is for the "Autobahn" system in Germany alone. For all the European Union it is 76,823 km (2016 as well), so about equal to the US. Considering intensive expressways construction in Eastern Europe it may very well have exceeded the US length by now (2019).

You seem to confuse Europe with Germany. Speed limit in France is 130 kph, in Italy it's 120 kph. I usually set my speed control at 120.
Yes, European cars tend to be smaller and lighter than US cars, but in contrary to the US we have engineers building them so that they drive well. The drivetrain is adapted to European conditions and drivers, and the cars are much more stable (people liking to drive fast on narrow and curvy roads) than any of the US cars I rent while on the wrong side of the pond.