[bonzini]

8-cylinders are maybe 5% or less in Europe. But there are many 1000cc engines instead. A Prius is "only" 15-20% more efficient than a similar non-hybrid, even less if you consider diesels (which pollute more even though they consume less fuel).

[sampo]

> diesels (which pollute more even though they consume less fuel).

Diesels pollute more (much more) the kind of air pollution (NOx) which makes bad air quality locally. But they pollute somewhat less greenhouse gas pollution, which is directly related to the amount of fuel burnt.