See related story: Car Makers Go Green With Hybrids

The 2004 Toyota Prius, available in the fall, is more fuel-efficient and somewhat larger than the compact version that first appeared on American highways in 2000. Toyota says the latest innovations to the Prius will give the car a combined fuel-efficiency rating of "mid-50's" miles per gallon, a 15 percent increase over the previous model.
John Gartner