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I used to have a tachometer on my car that was also an hour meter, I made note of the odometer reading at time of install and a few times a year check to see what my average speed was, turns out it was about 28mph, after I bought my electric car and started using that for 90% of my shorter trips my average went up to 32mph.
I know that there are figures for how much energy is in a given area of wind at a given speed but I couldn't the specs that I have once seen, I did however do some quick math from wind turbine out puts at 25mph and figured you get about 10-12 watts per square foot of rotor area, the ECU for my car uses around 60 watts, then add to that the fuel pump, radio, lights and you need closer to 250 watts or more.
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