In just a few months, I've put on 10K miles on my new 2012 Prius (he's going in for his 10K service tomorrow). Car computer is showing me that I'm averaging a combined 48MPG, yet when I track the MPG on Fuelly, it's 45MPG or thereabouts. I don't really care.... Whatever is correct is still awesome. Use the radar cruise control every day on my 130 mile (round trip) commute and love it. Lane Keep Assist is not something I use very often. It's a gimmick, IMHO. Overall, I'm quite happy with the car.... and it's doing exactly what I thought it would do: save me $$ at the pump!! YAY!