Fast-forward a year, and Ghosn, now chairman and chief executive of the Renault-Nissan-Mitsubishi alliance, insists his expanding empire needs to grow bigger still.
Joint savings have been Ghosn's strategy since he parachuted in from Renault to save a floundering Nissan in 1999. But now he is pursuing savings on an even more massive scale to feed soaring demand for investment in electrification, connectivity and autonomous driving.
Ghosn let the numbers rip as he outlined his first business plan for the three-party partnership in September. Combined sales will reach nosebleed levels of 14 million vehicles by 2022, from 9.96 million last year. More than 9 million of them will be built on common platforms. Drivetrains will be shared across three-quarters of the fleet, from a third today.
And then, he predicted, those sweet savings will kick in. Yet, Ghosn isn't chasing savings for their own sake. What counts is how the alliance uses them.
And the veteran CEO has a vision for that as well. The money will be channeled into costly next-generation technologies that rivals without the scale will find harder to afford.
The blitz includes 12 new zero- emissions vehicles across the alliance by 2022, all based on new commonized electric vehicle platforms.
Some 40 vehicles will be introduced with varying levels of autonomy. And the alliance will also introduce a robo-vehicle ride-hailing service.
It took years for Renault and Nissan to significantly mesh operations and cut costs. So it won't be easy to integrate troubled Mitsubishi for the projected exponential boost in synergies.