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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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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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.
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...
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...
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...
1 - 8 of 8 Posts
