Don't run premium. The engine is designed for Regular. Premium will only cost you more in the long run....and short run.
Premium is for vehicles with higher compression ratios. its HARDER to burn...
You are doing yourself a disservice by putting premium in the jeep.
Don't think of fuel as "regular, decent, and Great". think of it as "normal, moderate, and high performance". of course remembering that high performance fuel will NOT make your normal vehicle a high performance vehicle.