Considering my lifted 20 tacoma with just under 33" tires sees that on it's best days with only 278hp, makes it a no brainer going with the RR.I have been running 87 and getting 18.2mpg. Got about 1000 miles on my RR.
Actually the manual isn’t clear on that. Below is a screenshot from it that I interpret to mean “you can get away with 87 but you’ll get better performance by using 91.” Also there’s nothing specific about fuel in the "Raptor Unique Features" section of the Ranger manual nor the Raptor specific supplement .87 is the recommended gas for anything but the Raptor