They need to be as light as possible when there are motors in there, and they will not vent very well at the back because of that motor.
I cannot imagine they would put holes in there if it could be avoided. Look at the wheel spoilers ahead and behind the tires. These guys are not unaware of aerodynamics.
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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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