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Discussion Starter · #1 ·
Has anyone had any engine problems? My GW III engine light came on and the dealership asked what type of fuel I was running? Let's just be real, regular unleaded, especially with prices skyrocketing. They told me that I need to be using premium fuel to avoid this happening again. Just curios as to what type of fuel you all are using. Especially with prices skyrocketing, kind of absurd to me. TIA
 

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2022 Grand Wagoneer series III
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If you read what is actually recommended, the manufacturer actually says use mid grade and NOT premium which I’ve never heard before. I just took a trip in mine from Texas to Colorado. Their mid grade there is 87 octane and premium is only 91. I felt like a fool but used premium. On the way back I used all three grades and believe it or not the worst mileage was with premium.
 

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Discussion Starter · #3 ·
We are on a road trip now, so we will try it out. Thanks for sharing. I used the auto start the morning my engine light came on and it died shortly after I started it. We are wondering if that has anything to do with it. Who knows, but considering I have had it a month and it's been back to the dealership more times than I can remember, just thankful I got the warranty. (The back motor for the AC/heater never worked and had to be replaced)

Thanks again!
 

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Run what is recommended in the manual.

Its not just for fun, It is based on the engine tuning. Best case, running lower octane than it is tuned for will cause the PCM to detune the motor when it detects pre-detonation. Worst case you damage the motor.

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If you have the Grand Wagoneer you must use 91 octane minimum.

The vehicle can detect fuel quality and will change timing (performance) accordingly.

As stated before lower octane fuel detonates (knocks) easier with higher compression engines. The GW engine is very similar to the Challenger 392 Hemi scat pack, probably different oil pan and intake... exhaust manifolds maybe.

Besides, if we can afford a six figure car... knowing the MPG was horrible... we can surely afford to pay out the nose for fuel...

I also have a 2021 Jeep Rubicon 4xe. I haven't filled it up in nearly a month and a half now... I figure the average between the two average out to be closer to normal.

However I'm far from normal.... it's just an off road toy for me...
Automotive parking light Wheel Car Sky Tire

Already put on 37's and a 3.5" lift.

My GW is at the dealership getting fixed. I'd be more than happy to have it back, even paying over $6 a gallon for it's measly 10 MPG. It's all about perspective...
 
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