I am new to this forum, and have an '04 Prius purchased 10/29/03. I turned over the 30,000 mile mark this morning just having left my dealer after the car was serviced. I filled up, and updated my overall mpg since purchase, having kept all receipts. The result: 52.6 mpg, covering all types of driving conditions. I do try most of the time to drive with fuel conservation in mind, but once in a while I use the power mode entering the freeway, etc. I keep an eye on the computer, so I know when I am getting the best mileage. In another message someone suggested accelerating rapidly from a stop and then leveling off at cruising speed. I believe you can do better by gradually picking up speed and easing back on the throttle when you reach the speed you want. I rarely drive over 65, except on a recent trip to Las Vegas, where I cruised at 70 out on the highway. That trip got me 51 mpg, just like they advertise. Most of the time, I find cruising in the 55 to 60 range delivers the best mileage, based on what the computer is showing. Funny thing about the computer is that I rarely am able to match what it shows at the time I fill the tank. I think it is because the tank is actually an expandable bladder, so it is hard to get it filled to the same point each time. Over time, with many fillups, I think it averages out. Finally, I am very pleased with my Prius, and think it is a good value and fun to own and drive. I am a professional chauffeur, and have the opportunity to drive lots of different cars, which I enjoy. But, when I park the Maybach 62, I also enjoy the trip home in my Prius.