Hello - We were averaging 48-49 mpg for about the first year on our 2007 Prius. Immediately after our regular dealer service, mileage dropped down to 39-40. No other changes were made. Even with my best pulse and glide efforts, I can't get past 41 now for any significant time, and we actually get better mileage on the highway than around town now. It seems like we have more drag on the glide now, and it's rare that we are able to get the battery level up to the green bar, despite accumulating many car icons in the bar graph screen. Toyota says everything is fine and checks out - "lots of drivers get less than 40 mpg." I wonder if our battery is charging/functioning properly despite Toyota's assurances. Another problem is the fuel tank-bladder is not allowing us a full fill-up, even though we already had it replaced once. Thanks for any advice you can share. Thanks!