From what I have seen, the Bronco isn’t much lighter than the F150 (5k bs 5.5k?). The Raptor may be heavier than a regular F150? Still would be surprising in the sand for the 2.3 to keep up that well. Hopefully we find out!The Raptor is a much larger vehicle. I would bet its the 2.3. I haven't even seen a 2.7 pre production model out in the wild yet.