Currently, the research effort has pioneered a hybrid engine that is cleaner than a diesel engine and almost twice as efficient as a typical gasoline-powered engine.

FORBES: The Other "Hybrid Engine"

The BR500's four-stroke engine is five times cleaner than the standard two-stroke models.

NPR: L.A. Looks to Cut Smog with Leaf Blower Trade-In

The graphics haven't been completely updated (the cars are basically still just standard polygons), but the UI is cleaner, a physics engine has been added in with power-ups and other goodies, and there is a really robust replay system, which lets players save their best shots and stunts on video, and edit and upload those to YouTube and other video sharing services.

ENGADGET: blogger-avatar