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Fuel octane


Mike B
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Reading my manual for our 2018 Fusion with the 2.0 Ecoboost. It says it's designed to run on 87 octane. It also says to run premium during the hot times of the year. Is it really necessary to run premium during the hot summer? Here in Oklahoma, our temps will run anywhere from the mid 90's to low 100's. 

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It says the exact same thing for my 1.5T.  I've been using 89 this winter, which I intend to keep using unless I run into issues.  Mine's a '17 that I got last September.  Try the same and see.  Here in Charlotte, we generally run in the 90s from June to September but it can vary.

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  • 7 months later...
2 hours ago, Waldo said:

The EcoBoost is direct injected, so the fuel never runs over the valve.  Therefore running a higher octane fuel won't help clean any carbon off the valves - that's why it's an issue in the first place.

Wow, Waldo!  Thought you'd left us forever.  Welcome back.  Happy holidays to you and your family.

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  • 2 months later...

Mine is a 2013 ecoboost 2L. First I used 87. Then went back to 93. Engine much quieter, no downshift uphill. I don't mind the 20cents. My tank doesn't hold that much and I do get 1.8 avg mpg n town and 3 on hwy according to trip. I think a lot depends on how u drive. I don't get on mine, don't have to. Pass on two way Hwy easy w/o much more pressure enough 4 turbo kick n.

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On 12/25/2018 at 11:36 PM, jerry12 said:

I run 93 octane in both of my 1.5 EcoBoost Fusions because of the vales carbon issues.  

I also get  about 2.0 more miles per gallon with 93 octane .

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19 hours ago, Wolfie1 said:

Mine is a 2013 ecoboost 2L. First I used 87. Then went back to 93. Engine much quieter, no downshift uphill. I don't mind the 20cents. My tank doesn't hold that much and I do get 1.8 avg mpg n town and 3 on hwy according to trip. I think a lot depends on how u drive. I don't get on mine, don't have to. Pass on two way Hwy easy w/o much more pressure enough 4 turbo kick n.

20 cents?? Where do you live? Here in the Chicago area, premium is often 60-90 cents more than regular!

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If premium is only .20 a gallon more (which used to be the norm, but is rare now, I think it is closer to .40 to .50 or more locally for me), seat of the pants and mileage increases make it worth it.

 

I had a premium recommended car (97 Mark VIII) that got much better mileage and drivability with premium, my cost difference of .30 a gallon was where I would not go with premium.

 

but:

20 mpg at 2.00 a gallon for 87 (10 cents a mile)

22 mpg at 2.20 a gallon for 91/93 (10 cents a mile)

Seems like a wash, and I would run premium in this case!

 

The HP and torque numbers you see for the 1.5, 1.6, 2.0 listed are using 93 octane.

There are a variety of blurbs for different years, but generally for the GTDI engines (not the 2.5)



Premium fuel will provide improved performance and is recommended for severe duty usage such as trailer tow.

 

To be fair, with my 2017 Escape with the 1.5, they don't show the HP rating using 93 octane, but the owners manual does say that for increased performance, mainly hot conditions or towing, premium is recommended for all engines.

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