How much did the most expensive car ever sold go for, in US dollars?

How to get close to this number

Price it as art rather than as transport. A functioning car is worth thousands; a car that exists in a run of two, from a famous marque, with racing provenance, is competing with paintings at auction. Record art prices run into the hundreds of millions, and a record car sits just below them.

The rarity is doing all the work. Only two were ever built, which means the market cannot establish a price through repeated sales — there is no comparable, so the price is whatever two determined bidders decide in a room. Unique objects have no market price, only auction results.

The proceeds detail is the unusual part: the money went to a fund for environmental science scholarships. A record-breaking sale of a combustion-engine racing car funding environmental education is a juxtaposition worth noticing, and it is also why the seller was willing to part with an object that had no commercial reason to move.