Re: Using 89 Octane
89 is recommended, although 87 is allowed. I personally would rather pay the extra ten cents per gallon for better performance, and take better care of the investment in the vehicle. I kept my previous two Jeeps for seventeen years each before buying new Jeeps.
JEEP 3: 2011 Grand Cherokee Overland 4x4, Hemi V-8 with MDS, Multi-speed Automatic with ERS, Quadra-Drive II with Rear ELSD, Off-Road Adventure Group II, Selec-Terrain, Quadra-Lift, Towing Group IV, Advanced Warning & Adaptive Cruise Control, Bright Silver Exterior with Beige Leather Interior
MODS: All-Terrain tires, Passenger-side "Trail Rated" Badge, "5.7L" and "Hemi" Badges, "70th Anniversary" Badge, Mopar Cold Air Intake, Custom Engine Cover, Chrome Fog Light Bezels, Bright Pedals, Illuminated Door Sills, WeatherTech in front / back / cargo / license plate frame, Mopar Roof Rack, Thule Ski Rack, Thule MOAB Cargo Basket
JEEP 4: 2014 Cherokee Trailhawk 4x4, 3.2 liter V-6, 9-speed Automatic with ERS, Active-Drive II with Rear ELSD, Technology Group, Comfort Group, Cold Weather Group, Granite Exterior with Brown Interior