Re: What octane gas?
Regular is sufficient for the V6. I believe the hemi likes midgrade 89 octane, but many report that 87 works fine on that too. Putting in premium is a waste of money unless the vehicle specifically calls for it. MPG shouldn't be affected.
My Jeep: 2001 Grand Cherokee Limited, 245/65R17 Falken Rocky Mountain ATS, K&N drop in air filter, Bilstein HD's. De-badged, eagle-eye LED Tails & LED 3rd brake light, Addco front and rear sway bars, Superchips tuned & TM snip, interior 6k LED's, Gen3 ccfl projectors with Volt 6k HID lows, akebono brake upgrade with R1 Concepts premium rotors.