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Vacuum is very thin stuff, but that makes leaks easy to find. The effect of any stray air would be almost pure friction. However, it is expensive to pump vacuum, so a seal is normally maintained. The safety enclosure would double very well as a vacuum tank. The best bet for getting the power in and out seems to be spinning a permanent magnet and using high-frequency electronic commutation to a ring stator. In the lab, efficiency can beat a battery, but I'll wait until I can buy the whole system off the shelf. The effort has not been abandoned.
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There is no excuse for a land vehicle to weigh more than its average payload.
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