I took our 2008 touring in for the recall work (steering shaft, water pump and the gas pedal) picked it up a day later all work free of charge and the through in a free rental! My paper work suggested a few other things needing to be done. Clean the MAF and Throttle body, being a DIY guy I did these items myself and my mileage on our next tank went up to 53mpgs!! I would suggest if you see a drop in milage even if your not check them out, easy to do for a jump in MPGs!
Cleaning Mass Airflow Sensor Instructions | PriusChat Toyota Prius: How to Clean the Mass Air Flow (MAF) Senor - PriusDIY.com TB cleaning