If you have a 2012 model year Prius let us know if the MPG gauge is accurate or if its over reading like the 2010, and 2011 model years are by about 3 - 3.5 mpg. I have read that the 2012 Prius C model the gauge when tested by Wayne Gerdes of Cleanmpg.com, was within 1% accurate. So, I am just wondering if the 2012 Prius has more accurate software in the system. alfon
Yes, we were told by Toyota at the press event last year that the 2012's will have a more accurate gauge.
I only have data from two fill-ups and so far it looks like they are off by almost 7%. I know that sample is too small here but will continue to update as I get more data. Tank 1 45.7(Calculated) 48.7(MFD) MFD off by 6.56% Tank 2 46.2(Calculated) 49.6(MFD) MFD off by 7.35%
I have 3 fill ups so far and I confirm that the gauge is off still. For example... Tank 1 54.4 (MFD) 51.4 (Calculated) Tank 2 54.2 (MFD) 51.0 (Calculated) Tank 3 56.4 (MFD) 52.8 (Calculated) Hope that helps.
Prius v 5, 2012 Tank 2 over a 264 mile freeway round trip. Average speed 70mph 37.84(Calculated) 41.9(MFD) MFD off by 9.68%
Looks like the truth is in and Toyota did not upgrade the Prius V and regular Prius mpg gauge softwareto to reflect a more accurate reading. But, according to Wayne Gerdes, when he tested the new Prius C and filled up to the top of the tank, where you can see the gas, than drove about 60 miles round trip and filled up again at the same gas station and same pump right up to the neck again the mpg was just about on the money between calculated and indicated. I believe it was about 85 mpg.
Dang! I thought I was going to hit the magic number 50 with this tank. Below are the details. Tank 3 49.5(Calculated) 53.3(MFD) MFD off by 7.67%
That should be an easy software fix . . .yet it still isnt fixed. Hence, I conclude that Toyota wishes the software to remain exactly as it is. Why? So that those Prius owners who are NOT as A-R about tracking their mileage as we are will continue to feel good about their purchase and brag to their friends about their (slightly inflated) MPH. No?
hmm 7% seems to be the magic number. If PiP has the same margin of error, when CONS reads 200mpg, it's actually 186mpg. Way to go Toyota.
