fuel for a 2015 5.7l overland Grand Cherokee

Brilliant but could you answer the question Please n thankyou

Just use the middle grade gas just as good as the premium.

ill c;larify as you guys are US and im aus here we have unleaded fuel ( yes all fuel is unleaded) so to clarify what octane dealer says 98 but vehicle manual says 93 3 fuels available here are regular 93 premium 98 or unleaded 95

98 in mine makes a huge diiference in performance,95 is abit jumpy at low revs but 98 is so so smooth

I think you already got the info you wanted, but I have the same year and engine as you (in a limited), and I'm in the U.S. & have found that midgrade is just as good as premium. Here, we have octane ratings of 89, 91, and 93, but I believe the differences in numbers between the U.S. and Canada are differences in the methods used to calculate the octane ratings, rather than actual differences in fuel grades. Down here, 100 octane is considered "racing gas" - with 108 being as high as it gets (and I don't think a factory engine will run on it).