[yunohn]

> driving highway speed takes more gas

Hmmm, in my experience, highway speeds are conducive to ICE efficiency and use less gas than city traffic stop and go results in. It also disperses pollution outside the areas people work/reside in.

[creshal]

There's three speed categories as far as the EU is concerned:

- highway

- not highway, not city

- city

The 90-110km/h limits of regular roads tends to hit the sweet spot of engines more reliably than the 130+ of highways, a lot of smaller European car engines are uncomfortably close to redlining at 130+, especially older ones.

[sdeframond]

Air resistance is not linear, which makes it difficult to be more efficient at higher speed, even if the engine is tuned for this.

In my personal experience with both my current and previous cars, the sweet spot is constant speed about 65 to 80kph.

It does feel slow though.