87 vs 89 octane

[CAMDENN]

I use 89. I've heard that 87 is the reason they had a lot of oil consumption issues with the older 5.0L's. Could just be a rumor. That's the reason I use 89.

I see no reason to go 91-93.

…Definitely a rumor.

 

[Wile_Coyote]

I run 91 in mine and have since I bought it

 

[Aandrews109]

Have run 87, 89 & 93 in my ‘23. It definitely runs best and gets better mileage on the 93. Made two trips to the same destination over the past 1 1/2 months. 87 first trip yielded 19.5 mpg. Second trip on 93 yielded 21.5 mpg.
However, as someone else said, don’t think the mileage makes up for the extra cost.
I definitely run at least 89 when towing.