The dozen owners of Lamborghini Venenos -- an ultra-rare supercar that cost $4 million and up -- will be receiving some bad news via registered mail: their Italian dream machines are being recalled. The 12-cylinder, 750-horsepower models that Automobili Lamborghini SpA billed as a "street-legal racing car" are among about 5,900 Aventadors the carmaker will recall worldwide over risks that a fuel system fault could lead to fires, the company said Tuesday. Included in the recall are the only three Venenos hardtops sold, which carried a price of about $4 million (3 million euros), plus another nine Veneno Roadsters, originally listed at $4.5 million. About 1,500 Aventadors, which start at around $400,000, also are affected by the recall in the U.S., according to a recall notice posted on the National Highway Traffic Safety Administration's website Tuesday. The ultra-rare Venenos have appreciated in value like works of art since they were built. Lamborghini said in 2013 that it would sell