Col. Crackpot wrote:
subcompact: Prius
compact: Corolla
mid-size: Camry
full size: Avalon
.
the mid size is the average American size. Usually with a large (2+ litres)4-cyl or a small (3+ litres) 6-cyl engine. There aren't as many V8 cars in the US as you think, other than pickups and SUV'S.
Then it's not as different as you believe.
The differences are following:
1. European cars considered compact by the US are considered small mid-size in their native countries. (eg. Skoda Octavia, Alfa Romeo 147, VW Golf)
2. The larger European mid-size cars are generally the same as their American counterparts, but they tend to have smaller engines and are slightly smaller. (eg. Peugeot 406, Renault Laguna, Volvo S60)
3. In Europe, cars such as the Toyota Camry, BMW 528i and the Opel Omega (sold in the US as the Cadillac Catera and in the UK as the Vauxhall Carlton) are believed by some to be large cars, while others consider them to be the heavier end of the midsize market segment. Because of this, they are regarded as luxury cars and carry more prestige than they do in US. (save for the Audi A6 and Mercedes-Benz E-Class) This might have caused some of your confusion.