91 Octane wont hurt anything though if your running a 91 tune through superchips. I have been running either 91 or 93 octane in my 4.7 XK for over 3 years now with now problems. Well beside the hole it makes in my wallet.
91 Octane wont hurt anything though if your running a 91 tune through superchips. I have been running either 91 or 93 octane in my 4.7 XK for over 3 years now with now problems. Well beside the hole it makes in my wallet.
2007 4.7 Liter XK | Front Modified OME HD Lift | Rear 4" Superlift | JBA UCA's | Rusty's Rear Adjustable Track Bar | Rysty’s Adjustable Upper and Lower Rear Control Arms w/Heim Joints | Mickey Thompson Classic III 17x9 Wheels | 315/70R17 Goodyear Duratracs | Airflow Snorkel | Flowmaster 40 Series Muffler | Superchips Flashpaq | Mopar Skids | 4xGuard Belly Guard | American Rebel Rear Diff Cover | Rear Powertrax No-Slip | Front Electronic Locker | Rear Heat/AC Delete
the HEMIs have to be careful tho with the higher octanes, Im wondering tho if Im losing performance and mpg due to pre-ignition???? Seems to be an issue after researching this is a common topic. I didnt buy my XK for fuel economy but the sudden drop was concerning, Im going to start with 91 and see how it runs... This is going to be an expensive guess and check game
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
I use Shell and Sonoco 89 by me.
If you've been switching between 87 and 89, try sticking with 89 for a few tanks so the computer isn't constantly trying to adjust between tanks.
Ok Ill do 89 then for a few and see what happens. Still doesnt explain the sudden drop but oh well. No codes, no lights no problem.. I hope!
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
My memory is escaping me.... how many miles are on it and do you know when the plugs were last change? I noticed a stark decrease in mpg as I approached 30k on my plugs.
Maybe disconnected the battery for the hell of it too.
Ive got 79k and only 2500 miles on the plugs, just did complete 60k service-all fluids plugs front diff bushings belts- when I purchased. I will disconnect the battery to see how that helps...
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
I disconnected the battery for a min to reset the computer, I will update to see if that does anything...
2K6 Limited Jeep Green Metallic/Saddle Brown Leather XK HEMI QDII Old Man Emu HD Suspension w/ Fox Emulsion 2.0 Rear Shocks 1.5" SpiderTraxx Wheel Spacers 265/70 GoodYear MTRs w/Kevlar True Dual Exhuast w/IMCO 50 K&N 63 CAI Diablo 91/Performance Transmission Tuned SA Belly Skid MOPAR Gas Tank Skid, Transfer Case Skid, Suspension Skid Front Tow Hooks 6k HID Lows/3k Fogs
I hit 17-18 MPG coming this last weekend 6 people plus luggage and both front and rear AC on I did however have my basket and cross bars off. Running no tune just corrected for tire size and on 87 octane.
Literally a minute? Needs like 10-15 for memory to reset (I turn the key on for good measure too)
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