Does anyone burn 87 octane or do I have to burn premium gas

  • Thread starter Thread starter G-874295
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I've burned 87 octane since I bought the car. IT IS DESIGNED FOR IT. As a very conservative measure, when towing my heavy boat I try and remember in advance to put higher octane in the tank. The reality is you don't really need to do so - the knock prevention controls work fine.
 
Just stay away from the 85octane in mountains.
 
I use 87 in my 2025 Aviator and 2014 Navigator.
 
Just bought a 2025 Aviator and asked the dealer before leaving what octane they filled it with, they have to give you a full tank. They said they put 87 in all the cars before they leave.

Found a couple articles on a deep internet dive with the engineers behind designing the engine. They both said they run on 87 but if you’re planning on keeping it a long time, you’d be better off using 91. Then gave a bunch of technical reasons over my head.

I did try 87 on my 2023 Aviator after running 91 and two days in a row it had some very bad idling like really struggled to keep running thing. We settled on 89 now and no coughing and wheezing for thousands of miles.
 
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Dguffin said:
87 on my 23 Aviator. I stay away from any alcohol content. Just my preference.
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Do you always purchase ethanol free fuel? That's quite the cost adder.

Or are you saying you do go with standard 87 Octane gasoline (which happens to be up to 10% alcohol almost everywhere)?
 
Vin0770 said:
Just bought a 2025 Aviator and asked the dealer before leaving what octane they filled it wit, they have to give you a full tank. They said they put 87 in all the cars before they leave.

Found a couple articles on a deep internet dive with the engineers behind designing the engine. They both said they run on 87 but if you’re planning on keeping it a long time, you’d be better off using 91. Then gave a bunch of technical reasons over my head.

I did try 87 on my 2023 Aviator after running 91 and two days in a row it had some very bad idling like really struggled to keep running thing. We settled on 89 now and no coughing and wheezing for thousands of miles.
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I've used both 87 and 91 octane gasoline, and honestly can't say I've noticed a difference except for the price. My preferred grade is 91, especially in the summer.

Peter
 
Since our 3.0 liter engine is twin turbo with high boost pressures, I've been running 93 octane premium in my '21 Aviator GT. I believe this will provide maximum performance from the engine, and the extra detergent additives will hopefully keep the injectors cleaner longer. Being a hybrid, I'm averaging mid-40's to mid-50's mpg so the extra cost of premium fuel isn't as bad.
 
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Juggernaught said:
Since our 3.0 liter engine is twin turbo with high boost pressures, I've been running 93 octane premium in my '21 Aviator GT. I believe this will provide maximum performance from the engine, and the extra detergent additives will hopefully keep the injectors cleaner longer. Being a hybrid, I'm averaging mid-40's to mid-50's mpg so the extra cost of premium fuel isn't as bad.
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Extra detergent additives are in top tier fuels, regardless of octane. Most major brands are top tier. There are other discussions about top tier on this forum.
 
C Krohn said:
Extra detergent additives are in top tier fuels, regardless of octane. Most major brands are top tier. There are other discussions about top tier on this forum.
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At my station, the amount of cleaning agent called Tactrol and the amount depends upon the octane grade you select.

Peter
 
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