DONGFENG NISSAN UNVEILS VIWA CONCEPT AT AUTO SHANGHAI 2013 - New EV concept embodies VENUCIA's vision of future electric mobility - MY2013 D50 and R50 showcased with improved fuel economy SHANGHAI, China (April 20, 2013) - Today at Auto Shanghai 2013, Dongfeng Nissan Passenger Vehicle Company (DFL-PV), the passenger vehicle business unit of Nissan's joint venture in China, unveiled VIWA, a new electric vehicle concept, under the VENUCIA…