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As a general rule, the bigger the tire size, the lower the rolling resistance - bigger meaning any of the 3 dimensions used to describe a tire size.
HOWEVER, the effect is small compared to the differences between tires - meaning make and model.
Unfortunately, there has not been much published on the RR of light truck tires. But you need to be aware that RR, traction (especially wet traction), and treadwear are part of a technology triangle. To get improvements in one area, one (or both) of the other areas has to be sacrificed.
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