Theoretically it is possible, however it is also highly unlikely, no-one is sure if this has ever been achieved, by anyone alive or dead in todays world.
It is believed that someone once tried to create this seemingly impossible task but with little success. We would surely know if they had managed it for a prolonged and sustained period of time. There certainly is no film footage of it ever having been achieved and no one has ever come forward to claim they have managed to maintain a full fleet of none or even more astounding less than no working vehicles - at the same time. We feel sure if this was ever accomplished it would be documented in the Guniness Book of World Records and that someone somewhere would have a very very small fuel bill to continue to run such a noteworthy fleet of vehicles on todays roads.