Capacities:
fuel tank : 1.6 gal (+/- 0.13)
engine oil 1,340ml (of which 120ml is in the filter)
hub oil 325ml
All specs - page 147 of the owner's manual for a 2018 Liberty.
American Fuel and Petrochemical Manufacturers:
"95 RON is roughly equivalent to 91-octane on the anti-knock index currently used in the United States."
O.S.