I had this discussion with one of my friends when we were driving on the motorway at a speed of 120 kph (75 ish mph).
I asked him to open the window and stick his hand out but first predict how much force he would need to hold it out. It was way more than he expected 
That times 100 is how much force the car needs to overcome to maintain speed, I told him.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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