I took delivery of my ribbon blue 2010 Prius IV with Nav and Leather pkg and immediately took her on a 214 mile trip and acheived 53,3mpg!! Cash to Clunkers was a good deal for me, but the shop who sold her to me acted like a used car dealer;-) The next day, a 21 mile trip on DC surface streets we got 38.3 with as many as 4 passengers. I have owned and driven a huge number of other cars and I must say this is a new kind of experience. The JBL sound system is good and visibility is much better than my chevy uplander. Driving position is a bit fiddly but this is a smaller car than I am used to. I am a bit confused with the Nav system. I am highly technical and have used Sat Nav GPS for nearly 20 years, but this one has a lot of puzzling features. I also note the passenger seat does not lower - I wonder of this can be retrofitted?