I'm sorry. I was not trying to put words in your mouth. There have been claims that the 17" wheels only drop 1mpg and I was referring to that. TheEPA number is very easy to beat in the Prius if you have the right commute conditions. It sounds like you do. I would be willing to bet that if the EPA tested the V their ratings would be much lower than the lower models. So in one way, yes I am saying the V would achieve lower EPA ratings than the II, III, and IV if all were tested. Because everyone has different driving skills, tolerance levels for applying hypermiling techniques, environmental conditions and commute routes, mpg will vary. So for you and I, meeting EPA ratings are easy with our 17s. It may not be for others yet in every case a set of 15" wheels will best the 17" wheels in terms of mpg. The main point is if the EPA had based their rating on mpg achieved with the 17" wheels the current rating would be much lower. How this discussion relates to this thread? That even seemingly small changes to the Prius can have a large effect on mpg. Maybe this is one of the reasons Motor Trend only achieved 36mpg in the 2012 Camry XLE after hundreds of miles of highway driving. The XLE has large and wide wheels.