Chongqing University,Chongqing 400044,China;
Chongqing University,Chongqing 400044,China;
Chongqing University,Chongqing 400044,China;
Chongqing University,Chongqing 400044,China;
Ford Motor Company,Dearborn M148150,USA;
life cycle assessment; natural gas based; substitute automotive fuels;