[laszlojamf]

Americans also drive A LOT more than Europeans on average, and generally (is my suspicion at least) with a lot bigger/less efficient engines

[Lwerewolf]

Not too sure about the engines as of late. Bigger and heavier vehicles - yes, but still mostly rural/highway, and at way lower speeds than the EU. Overall, IMO it's just the distances involved.

[ponector]

Lot's of European cars have 3 cylinders instead of American V8.

[cpburns2009]

The majority of American ICE vehicles are 4-cylinder, not 8.

[etempleton]

There are almost no new vehicles in the US that still offer a V8. They exist, but make up a very small part of auto sales.

[etempleton]

Not so much the efficiency of the engine but the weight and size of the vehicle. Almost all new cars in the US are turbo charged 4 cylinders if not hybrids or pure electric, but US consumers do prefer larger vehicles which are less aerodynamically efficient wnd heavier, which is really a direct result of the distance and reliance on the vehicle Americans have.