Well yeah the following things become obvious with a little chatting back and forth.
- Cars in the US are cheap.
- Surprisingly, even import cars in the US are cheap. European cars sold in the US are cheaper than they are in their domestic markets.
- Europeans, generally, have less disposable income because everything is so expensive (notably gas/petrol, but we are catching up), higher taxes, lower wages. Also in metro areas tight streets and good public transit drive them towards micro city cars or no car at all. Also look at the smaller properties typical in urban Europe and Asia (e.g. Richard bought a charger and it was too big to fit in the garage).
As a result, the big differential I see between American car culture and the Europeans, is the lack of "middle" range cars. In other words, the plebes have these tiny horrid 1 liter econoboxes made by Peugeot and such. A successful plebe can aspire to something as lofty as a Ford Mondeo. Then you have all the magnificent high end cars (Merc/BMW etc.) that only wealthy people can afford. And there doesn't seem to be anything inbetween. There seems to be a huge gap in Europe between the economy cars and the high end cars, I'm guessing that's where the Japanese fit in.
In American car culture there is a middle ground that does not exist in Europe. Cars like the Mustang -- you can't touch a V8 in Europe for twice the price. If I were a software engineer livng in London, could I afford a car with a 400hp V8? Now granted this middle ground is disappearing in America too.
So in general I'd say in Europe it's harder to be a car nut with a car of the performance level that any employed American can afford. One is more likely to have a small hot hatch. And I'm ignoring quality and fit/finish issues that would also alter buying habits.
On a visit to Tokyo, I discovered one of my hosts (a junior engineer) was a car nut and did Gymkana (autocross) so we got to talking. The car lives outside of Tokyo and if he's lucky he gets to drive it once a month. It's rather akin to how owning a horse would be here if you didn't live on a farm -- keep it away from the city and visit it from time to time. I suspect it can be a lot like that in the population centers of Europe as well.
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1986 Porsche 944 Turbo, 2000 Pontiac Trans Am, 2002 Jeep Liberty
"In fact, if I were to draw up a list of the 10 best cars I've ever driven, the 944 turbo would certainly be included." -- Jeremy Clarkson