For now, the new pontiff is out and about in the model used by his predecessor, Benedict XVI - the Pope emeritus. And Benedict's old Volkswagen Phaeton, a well-respected European limo, can certainly do the job.
It's a sleek, but not particularly ostentatious bullet-proof black four-door, with tinted windows. The International Business Times noted that Francis doesn't use the 12-cylinder Phaeton that VW CEO Bernd Pischetsrieder gave his fellow German, Benedict, as a gift in2006.
Francis has ridden instead in the more sedate Phaeton 3-litre V6, a diesel-powered car noted as one of the luxury European sedans with the best fuel economy.
And, says one Italian newspaper, he even wanted his motorcade reduced to only one car, a Ford carrying a security detail of Italian police (when in Italy security is provided by the Italian authorities, while in the Vatican that's the responsibility of the Swiss Guards).
Long-term, is a V6 diesel really green enough for this humble pontiff? Probably not, and in any case, "Phaeton" derives from Greek mythology, so is a wee bit pagan.
Francis could justify two more sustainable papal vehicles - one as Pope of the Catholic Church and the other as head of the Vatican city state.
After all, Jesus Christ was associated with a donkey for the triumphal entry into Jerusalem (humility) and a fishing boat - pushed a small way onto the Sea of Galilee - for addressing crowds (security and visibility). Precedent-wise, donkeys don't cost a lot, while most fishing boats do.
So how about an electric SUV for the high-vis engagements - football stadium-filled religious rallies, etc - and a classy electric sedan for more stately occasions, dinners with heads of state, and the like?
Perhaps the EV Mitsubishi Outlander (in New Zealand mid-year) as the former and the Tesla S as the latter.
Then again, donkeys just run on oats.