I started a new thread for the updates specifically for the issue of the inaccuracy of the FCD (fuel consumption display) on the 2010 Toyota Prius. We have about 4500 miles on ours and on every tank the hand calculated MPG is off 3 to 7 MPG from what the FCD reads. My wife gets about 54 MPG on the FCD and her tanks are usually 4 to 5 MPG less calculated. Last week I had two 500 + mile fills and The first was 5.5mpg less and the second 7.1 MPG . This was with a FCD display of 62 MPG which included a lot of around town in Madison for Hybridfest Green Drive Expo. The second tank read 64.4 MPG and it was fully highway driving. It was off by 7.1 MPG . 5 to 10% is out of the box for error. I fill up at the same station, same pump, same number of clicks, and same direction each time with the exception of the fill in Madison last week of which I estimated slope to be the same at the station I filled at. I stopped at the dealer and had them check it out to get a paper trail started. Nothing was found so I followed up with a call to start a claim with customer care the next day. They took my information and later that day, Heather from customer care called back. She gave me a file number to record to use if I called back. She was going to investigate and call me back this week. Heather just called back and said she had talked to field service reps and engineers and they informed her they were aware of an accuracy issue of 8% to 10%. They were looking further into the issue and expected something would come out in the form of a TSB. Once again I am impressed by the quality of Toyota's attention to their product.