Once set for production in the spring of 2015, the fourth generation of Toyota’s Prius will instead enter production beginning in December of said year.
Automotive News Europe reports the delay is due to engineers wanting to massage as much fuel economy as possible, along with adjustments to the chassis and body. The confirmation model of the new hybrid is expected in November 2014, 12 months before production is set to begin; the plug-in variant will follow in October 2016.
Though Toyota declined to clarify the reasons behind the delay, managing officer for product planning Satoshi Ogiso said the new hybrid will serve as a test bed for the automaker’s modular Toyota New Global Architecture and a new hybrid system that will be more compact and lighter than the current system while delivering a thermal efficiency rate above 40 percent. The system will also support a wider range of engines and vehicles beyond the Prius and Camry hybrids.