2010 Honda Insight Hybrid. The press boys got their hands on one and it got written up in the new Road & Track. EPA mpg estimates are going to be 40 city/43 highway, but the Road & Track writer saw 54 mpg the other journalists all consistently got 55-65+ mpg, with one guy getting 70 mpg. Wow. If the car can deliver that and is reasonably comfortable/safe and comes in at the projected MSRP of <$22K, they will sell a ton of those bad boys. That will put huge sales pressure on the Prius, which strikes me as pricey, even though Toyota reportedly makes very little or loses money on the car at the moment.
A 5 passenger hatchback that gets 55 mpg? That's off the hinges. That's similar fuel economy to a smaller engine motorcycle (500-800cc).