I've never heard of a 4.0 turbo in the JL. There's the 2.0L turbo, which is what I have in my '20 JLU Recon. The owner's manual says 87 octane is acceptable or 91 octane premium for top performance.
From your owner's manual for the 2.0T:
This engine is designed to meet all emission requirements, and provide satisfactory fuel economy and performance, when using high-quality unleaded "regular" gasoline having an octane rating of 87, as specified by the (R+M)/2 method. The use of 91 or higher octane "premium" gasoline will allow these engines to operate to optimal performance. This increase in performance is most noticeable in hot weather or other heavier load conditions, such as while towing.
a 4.0 turbo would be a a parts breaking good time. I have noticed no real MPG difference with the higher octane fuel. So I run 87 with no issues. And I have the heavy 4 door with large tires and hard top
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