I have an 08 and after reading all of you guys comments about how to improve MPG, I did Improved from 56.1 MPG to 58.7 MPG in city without using AC base on 31 MPH and 50 MPG to 52.5 MPG base on 65 MPH with AC. I've tried everything to improve my MPG. Below is what i have done : 1. Fill gas half of a tank to reduce heavy weight on a car 2. Set temp to 73 3. Tire Pressure 45 PSI 4. Slowly step on gas penal 5. Accelerate to 36 MPH on 40 MPH (IN CITY ONLY) 6. Release gas penal all the way for only 2 second and slowly step on gas penal to keep your speed on 31 MPH. 7. Shut off AC 8. Release gas penal if you see a stop light in RED Color ( This will always save you a lot of gas everytime you do it) Hope this will give you an idea and i am hoping to get ideas from all Prius owners!