Ford is set to join another niche powertrain market in the US, with the auto giant reportedly investing in range-extender electric vehicle (EREV or REEV) technology as demand for its battery-electric vehicles (EVs) slows. Bloomberg reports Ford is currently engineering the base technology for EREV powertrains, which offer greater flexibility and less range anxiety than an all-electric vehicle. Blurring the lines between an EV and plug-in hybrid (PHEV), EREVs typically function as an EV but have a combustion engine that acts solely as an electricity generator to power up the battery when it runs out of charge or is close...