We are a three Prius family. We have a Barcelona red 2007 (bought lightly used in 2010 and driven by me). My wife has a new 2017 blue magnetism Prius Prime Plus (replacing her silver pine mica green 2006). My daughter has a 2017 magnetic gray Prius Prime Premium (replacing my original seaside pearl blue 2004.

I have collected extensive data, logging every tank of gas along with various data and maintenance records for the 2004 and then 2007 Prius. My lifetime average is 53.9 mpg. Link to data summary sheet.

Below are several data sheets and charts showing the 2004 and 2007 combined data. Click the image to open a full pdf. Here's a one page summary of the key data and charts.

My book, The Joy of Efficiency, covers this info as well, along with much more information on living an efficieint life.