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Tire design and tread, no question (to OP). Trade-offs have to be worthwhile, though. Same for wheels, load limit can’t be downgraded.
If i am averaging over 100k on a set of tires (and I do, easily) then the FE gain doesn’t mean as much (especially if tire life, tire/wheel loads or safety is downgraded).
Take-offs from later models of same truck are certainly of interest.
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