sentences:  On March 31, 2010, the first factory-built Chevrolet Volt was produced at the Detroit Hamtramck Assembly Plant in order to test the production line and for quality control purposes, both of the tooling and the pre-production vehicles produced before regular production began.In October 2010 Lotus Engineering unveiled the Lotus CityCar at the 2010 Paris Motor Show, a plug-in series hybrid concept car designed for flex-fuel operation on ethanol, or methanol as well as regular gasoline.The lithium battery pack provides an all-electric range of , and the 1.2-liter flex-fuel engine kicks in to allow to extend the range to more than .