I traded my 2009 Prius with 25K miles which never got lower the 47.3 MPG for a New 2010 Prius to take advantage of the advertised 51.0 MPG. What a farse. I now get no more than 41.0 mPG and most of the time about 37MPG doing the same driving. Toyota really screwed up the 2010 Prius.