The Toyota Prius started the hybrid revolution. It’s been 30 years since it was first announced, and we are now on the fifth generation. We’re going to see if the Prius Plug-In is still the hybrid leader. Back in 1997, Toyota debuted the first Prius, the world’s first mass-produced hybrid. It hit America in 2000, and it has been the most popular hybrid on the road ever since. For years, the formula was simple: a gas engine mated to a small battery and electric motor to capture kinetic energy during braking. Unlike other early hybrids from Honda, the Prius could operate in fully-electric mode, meaning some city driving could be done without help from the internal combustion engine. In 2012, Toyota reinvented that formula with the first Plug-in (PHEV) model. It used a larger lithium-ion battery and could travel 11 miles on a single charge. It was a good start, but it lagged behind competitors like the Chevy Volt, which offered far more EV-only range. Even the Gen 4 Prime, while better,...