Toyota Motor Corp., Mazda Motor Corp., and Subaru Corp. said Tuesday that they will each develop engines to enhance the performance of their electrified vehicles, including hybrid and plug-in hybrid models, as part of efforts to increase the competitiveness of their gasoline-electric line-ups. With the shared goal of achieving carbon neutrality, the three Japanese automakers aim to develop smaller, more efficient engines with higher output than existing models while also collaborating on the use of carbon-neutral fuels, they said. Such engines will enable vehicles to carry more batteries and e…