Maybe you can help understand something about mpg and speed.
As we did a long run in the Prius the other day and the wife was a sleep I took the opportunity to do some tests.
a) Reset the MPG counter
b) Set and maintain a given speed for between 13-26 miles.
c) Read off the MPG
The readings are center values of possible final variation and are worst case +- 2 mpg.
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MPH MeasuredMPG Curve[1]
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55 63 63.00
60 61 61.22
65 58 59.62
70 58 58.18
[1] This is the calculated (using the above equation) and the adjusted (for hilly routes).
I fitted the following curve
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mpg=(speed0/speed)^(0.33)*mpg0
From my flying days air drag is at least a squared function maybe even a cubed, not a 0.33
I also did some informal (undocumented) tests another time (maybe on another vehicle) that gave similar results.
Can you anyone tell me were I am going wrong ?