XL1 was a commercial implementation of the earlier concept. Things like hollow gears in the transmission, single seating and the side-hinge door weren't possible even at $$$upercar prices.
https://www.wired.com/images_blogs/autopia/2011/01/vw_one_liter_concept01_2.jpg
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0.26? 
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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