Hi,
We've been tracking Prius 2010 performance and recently confirmed Ken@Japan's report of a 5% error in the MPG display:
I'm still curious about the 'outliers' showing up above 55 MPG but we've only had the car in user hands for just over 100 days. There is a lot more to learn.
I've updated my "off the lot" chart of mph vs MPG using the 5% correction:
We've also collected user data on mph vs MPG and with the correction:
These same numbers are showing up in the user reported, EPA numbers:
We have noticed the Honda Insight, user reported numbers are significantly better than the EPA number. The Insight user reports are still too few but the trend looks good.
I've also updated my hill climb data to reflect the calibration factor:
Their is a growing consensus suggests it takes about 0.9 gallons/10,000 ft at 50 mph to climb a hill BUT we haven't finished our studies. Really, the vehicle has only been in our hands for a little over 100 days.
Bob Wilson