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I found an interesting mileage calculator the other day on the Ecomodder.com website.
Aerodynamic & rolling resistance, power & MPG calculator - EcoModder.com

You enter a number of parameters that apply to your car and it calculates a table of mileages and other parameters based on different vehicle speeds.

I have obtained the parameters for my Prius V and they are:
Total Weight 3340 for the car + me 205 = 3545
Cd = .29
Rolling resistance = (this varies with tires and driveline losses from .008 to .15) I used .011
Engine efficiency = 41%
Temperature = 68 deg
Frontal area = 23 ft cu

I calculated from the frontal area from sketchandcalc.com website app.
You take a picture of your vehicle and use a pen to draw the outline to form a closed irregular shape. I included in the picture a pizza box that was 10.5" square which was also in the frame with the car to calibrate the scaling factor for area.

The...