As you know if you drive a Prius or have been following this group, it is difficult to calculate fuel economy accurately with the Prius because of the bladder in the fuel tank that affects the ability to fill the tank the same on successive fill-ups. The only way to get a reasonably accurate calculation is to keep track over a number of fill-ups. Since I got my second Prius, I have kept an Excel spread sheet that calculates the average fuel economy per the computer and the actual fuel economy. In the first 955 miles since the car was brand new, the average fuel economy per the computer is 49.717 mpg. The cumulative fuel economy per my calculations is 49.454 mpg. Now, I realize that
955 miles is not very far, but so far I am truly impressed with how accurate the computer is.- posted
17 years ago