Something is wrong with this story.
I worked on the powertrain for these (don’t ask me any more) and they DEFINITELY were diesels.
http://green.autoblog.com/2009/01/15/presidents-new-ride-may-be-diesel-powered-but-is-it-emissions/
That and we bring all the fuel with them the portor dint just run down to the local station to fill it up more to this story than you can imagine
Since the press is probably no more educated on internal combustion than they are guns it may be just the opposite or something else entirely. (Forgot the keys???)
I am sure the secret service is all over this “mistake.”
The situation tends to reduce the options wrt presidential security. I sincerely hope they are paying attention now.