Vehicle, or tractor? Very different things, very different needs.
Best fuel efficiency on a vehicle would be bicycle tires inflated to rock hard. Wouldn't do much for practical use, but it would be most efficient. (Note the high-milage races, they all have bike tires of some sort.)
For hauling - trucks - you need a tire that can handle the load. The big singles are more efficent that duals used to be, so we see more new trucks with the large singles. Bicycle tires just wouldn't do much for a truck....
A tractor or other heavy pulling unit - it's all about traction, controling the wheelspin. Get the wheelspin low enough to be very efficient. The most efficient traveling tractor is the one with the proper wheelspin.
Duals, triples, or I've even seen quads, will control the wheelspin & improve the efficiency - but it all has to 'make sense' and be matched to the dirt & the load you are pulling & the weight of the tractor.
Driving down the road from one field to the next, a tractor is not efficient in any shape or form, so the number of wheels has about zero effect on efficiency of just traveling down the road. :)
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
... [Read Article]
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