This guy has had both generations of the Prius and he has tracked every drop of gas he has put in and updates his logs frequently. 2001 Prius: Lifetime MPG as of 59,827 miles was: 45.4 2001 Prius: MPG Average for April 2001,2002,2003 was: 46.1 2004 Prius: Lifetime MPG as of 12,487...