Ford 6.2 gas vs 7.3 gas highway gas milage

Thanks for your inputs, I know there are a lot of variables that affect MPG but I was interested to hear about any truck camper experience with the new 7.3 engine. Planning to order a custom build F350 soon and spec’d the way that I want the cost difference in the engines is only $1000. Initially I was scared off from it with it being new and expecting it would have lower MPG, but given that owners are reporting highway milage is basically the same as the old 6.2 I think the 7.3 might be the right choice.