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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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