I have been tracking my gas milage every fill-up since I bought my 2006 FEH. I have an Excel spreadsheet and I compare the actual MPG to the nav system's guess. The true MPG is on average 3% less than what the car is saying, and I have never gotten the car to say it is at EPA estimated MPG. The sticker is only there to sell the car. It will always default on the best picture for the manufacturer.