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http://forzamotorsport.net/en-us/fm3_factsheet.htm
All 400-plus cars in the game have been built with more than 10 times the amount of polygons as “Forza Motorsport 2.”
Play your way: New game modes. “Forza Motorsport 3” is an epic racing game featuring more content and more ways to play than any racing title today. An innovative single-player season mode puts you through a
completely personalized racing calendar that includes more than 200 different events, including
Circuit, Oval, Drag, Drift and Timed Events. No two calendars are the same; they react to the cars you love and the races you enjoy most.
In addition, the online multiplayer mode* gains an all-new game rules editor. This gives players a never-ending variety of ways to play with friends. Whether you’re a speedster, dragster, drifter, painter, tuner or just a lover of cars, “Forza Motorsport 3” is the definitive racing game for you.