Having had an “Aufbauseminar” for speeding when I was young. That was eye opening. We timed going as fast as possible versus going 100 kph tops on a distance of some 50 km (30km Autobahn, mostly unlimited). In the end it made a difference of like 2 minutes. But for that you spend like 50% more on gas and arrive completely exhausted.

Absolutely this.

I did a lot of traveling by hitch-hiking when I was younger, and had a lot of opportunity to study this. “Sporty” drivers would do speeding for one hour along a half-busy Autobahn section. Then have a five-minute coffee break.

And then, we would have the same slow cars again in front of us that we did overtake one hour ago…