Some of the early benefits, he said, would be "lower emissions, better use of the road capacity, safer journeys, more efficient journeys due to car sharing and possible savings due to different insurance or ownership arrangements".
Ironically, the Triple E carries 16% more cargo than the firm's next most fuel-efficient ship, but its engines are 20% smaller, meaning a slower, but more fuel-efficient journey.
Its logistics platform also claims to make haulage journeys more efficient.
Like Uber AG and Waymo, the idea is to take the strain off of drivers and help make journeys more efficient.
But as the experiment has progressed, the creatures appear to "plan" their journeys, developing a more efficient route.
These journeys can be made more efficient through data-powered route planning, which can help reduce the number of vehicles on the road.
Benjamin Greene, founder of the Farmery, plans to make the journey from farm to store more efficient by eliminating it almost entirely.
When pushed Purnell said that making part of in-house production more competitive would make them "thrive" while the BBC itself could continue on its "journey to be more and more efficient".
"Cars are amazingly efficient vehicles when they have four or five people in them, and we should be doing more to encourage more efficient use," said Ali Clabburn, CEO of Liftshare, a social enterprise offering commuters the chance to organise shared car journeys.
