Toyota Motor Co. will launch real-world testing of its plug-in Prius in Japan and Europe this month and will bring 150 of the cars to the US early next year, the automaker told reporters at the Los Angeles International Auto Show this morning. … Toyota to Test 150 Prius Plug-In Hybrids in US; Exec Says Retail Sales Will Follow. by Edmunds.com Green Car Advisor on December 2, 2009. Toyota Motor Co. will launch real-world testing of its plug-in Prius in Japan and Europe …