It very much depends on the car.
Removing the windscreen of a Prius style car would be very bad, as it is part of the whole aero design. I doubt the Kammback does any good without the windows.
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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 Gigameter or 0.13 Megamile.

For confirmation go to people just like you.
For education go to people unlike yourself.
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