Yea another BFG tire question Or 3 concerning OEM size.

I may have my 2018 Off-road OEM tires sold and I’m thinking about going back with the BFG AT KO2 which will be 265 70r 16 to keep it OEM size. My 3 concerns are:
1) Road noise, how much?
2) how much decrease in MPG
3) Rain/wet performance.

I know there are probably 1 million threads on this but most posters are going bigger and that changes everything, I’m staying OEM and would love to hear from anyone that stayed stock. As for driving I’m mostly highway unless the FD pager takes me off-road and that’s few and far between and not considered in my tire purchase. I basically like the looks myself. Will I love or hate the tire for my use? Over $1100 is kinda scary to just throw out there and maybe not like them or even hate em. Thanks guys!