The Platinum puts out max hp of 400 using 87 octane gas. We Dyno tested an XLT and a Platinum to see the difference. There is a noticeable difference between the 2 and a noticeable difference when using 91 to 93 octane fuel. However, as stated, it's not worth using the extra octane unless you are pushing the vehicle. I use 87 octane, unless maybe towing. And because of the design of the turbo system, the increase in mileage was minimal during normal driving. I'm lucky and get great gas mileage, on 87 octane, while others have complained, and I still have all the torque I want when I step on the gas, especially in sport mode. My mileage, in normal mode, is 18mpg city, as high as 28.6mpg on a long trip on the highway going 65mph. I actually got more than that, (29.9 highway flat road), on our last trip to Georgia using eco mode. But the loss in performance was not worth the extra 1mpg gain.
What model year(s) you tested with? I think d-rod mentioned the non-high-output engines are same starting from model year 2022.