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Wheels are open at the back where the brakes are. I doubt closing the front makes a big difference.
You cannot really lock up the air like that. It would start spinning round with the wheel and blow away through centrifugal force, being sucked in around the axle and pushed out at the rim edge. This may even aid rather than restict brake cooling.
As for spokes, it is the big rim bucket that causes most of the drag. The skinnier the spokes the bigger the gaps between them and the worse the air resistance would be.
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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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