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It is a German car.
At Northern European latitudes, mornings and evenings are long and the sun is only above 45 degrees for a few hours in the late spring and early summer.
Even in Germany a flat orientation is more efficient than a vertical one, but the difference is not as large as it would be closer to the equator.
The space is available, so if the weight is low - why not? It could easily add a few miles of range.
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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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