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They are heavier, and noticed a bit stiffer ride, but not enough to make me regret the decision. I have not put pen to paper on fuel economy as of yet, but the decrease is negligible IMHO.
Here's one link that I found. There are other links in the thread that might help. Nothing specific to the Raptor, but some good info that might help bridge the gap.
https://www.bronco6g.com/forum/threads/anyone-running-37x13-5r17-bfg-km3s.34799/