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Posted by Miwaku on September 18, 2006, 9:31 am
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dayoff53@gmail.com wrote:
> 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.
I've been doing the same thing for over 6,500 miles now, and my numbers
are 46.89 vs 46.28. After three rather revealing tanks where it was
clear that I didn't fill up all the way, I've come to trust exclusively
the MFDs numbers.
John1701 from most of the Prius forums challenged my conclusion that
the computer was just as accurate and suggested I look at his 120k+
miles of data. I pulled his data into my spreadsheets and found that
the numbers were within 2mpg of each other, too!
I track both, but I trust the MFD.
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