Which gas grade are you using? 2.7 EB

[TheLibrarian03]

I run 89 around town but will run 91-93 when traveling or towing. I average 21mpg around town.

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[kb2755]

I'll be using 87 (Top Tier - Costco) whenever I get possession in 2022!

 

[EatDirtFartDust]

I always suggest premium in a forced-induction engine. You get a little better gas mileage, though not enough to offset the extra cost. But you'll have less carbon buildup.

 

[Green_Bean]

Been running 87 for quite some time. Never had a problem so far

 

[Bobbert]

Wondering what gas grades are you guys using for your 2.7 EcoBoost? Regular grade (87) or Premium (91 or 94) grade?

I've always ran premium grade in my Evolution X Final Edition. It uses premium stock, ran great for the turbos!

87 octane since first day. 23.2 mpg on 2400 miles. Very happy with that.

 

[IconicXLTsport]

Asked the dealer to fill with 93 when I bought my truck. Stepped down to 89, then 87. Run 87 unless I’m towing, then I fill with 93.
There’s no more energy in 93 vs 87 so there won’t be any mpg savings to offset the cost. My commute is all highway so the engine is always at very low loads so the benefits of higher octane fuel would never be used. Always use top tier fuel for any octane.

Thanks to my 60 mph highway commute I average 25-26mpg hand calculated on 87. (Dash reads 27-28 mpg)

 

[Lippy]

I always suggest premium in a forced-induction engine. You get a little better gas mileage, though not enough to offset the extra cost. But you'll have less carbon buildup.

Why would you get less carbon build-up?

 

[Bobbert]

Wondering what gas grades are you guys using for your 2.7 EcoBoost? Regular grade (87) or Premium (91 or 94) grade?

I've always ran premium grade in my Evolution X Final Edition. It uses premium stock, ran great for the turbos!

Strictly 87 octane since day one. Getting a little over 23 mpg with 2400 miles on the odomete.

 

[IconicXLTsport]

Why would you get less carbon build-up?

Some believe there will be less random knock with higher octane but really the ecoboost computers are constantly trying to lean out the mixture under light load to save fuel until they detect random knock. This happens with any fuel grade. This leaning of the mixture is the only reason there is any improvement of mpg with premium fuel. The amount of energy in the fuel is the same, however the higher octane fuel can be run ever so slightly more lean for the same load on the engine. This will never overcome the cost of premium fuel however.

in the past, some fuel retailers only put the cleaning detergents in their premium fuels but I believe they are now required to put cleaning agents in all fuel tiers

High quality, top tier fuel should have cleaning agents in all tiers of their fuel so you should get the same cleaning ability in all grades.

 

[Lippy]

Some believe there will be less random knock with higher octane but really the ecoboost computers are constantly trying to lean out the mixture under light load to save fuel until they detect random knock. This happens with any fuel grade. This leaning of the mixture is the only reason there is any improvement of mpg with premium fuel. The amount of energy in the fuel is the same, however the higher octane fuel can be run ever so slightly more lean for the same load on the engine. This will never overcome the cost of premium fuel however.

in the past, some fuel retailers only put the cleaning detergents in their premium fuels but I believe they are now required to put cleaning agents in all fuel tiers

High quality, top tier fuel should have cleaning agents in all tiers of their fuel so you should get the same cleaning ability in all grades.

Higher octane is more resistant to knock, so the computer can run more advance with higher octane fuel and achieve better mileage. I agree the carbon build-up should be the same with regular or premium.

 

[Nightshade]

Thanks, guys! I think I'll be running regular gas grade during winter seasons and premium grade during spring to summer. I'm running my first regular grade right now while the first regular was dealer gas at the time of pickup. Over the summer, I did run premium, it somewhat seems to run a little better, but not noticeable. (3.5 Ecoboost)

 

[IconicXLTsport]

Higher octane is more resistant to knock, so the computer can run more advance with higher octane fuel and achieve better mileage. I agree the carbon build-up should be the same with regular or premium.

Yea. The engine can run more advance when under load to make more power, this is the reason the power figures are posted using premium gas. When cruising there is very little load on the engine and the effect of premium fuel is minimal.

Thanks, guys! I think I'll be running regular gas grade during winter seasons and premium grade during spring to summer. I'm running my first regular grade right now while the first regular was dealer gas at the time of pickup. Over the summer, I did run premium, it somewhat seems to run a little better, but not noticeable. (3.5 Ecoboost)

once the engine has adjusted to the octane you’re running, there will not be a very noticeable difference in performance unless you put the engine under load like towing. You will save a lot of money just running regular gas unless you’re towing.Just my view on the matter.

 

[Lippy]

once the engine has adjusted to the octane you’re running, there will not be a very noticeable difference in performance unless you put the engine under load like towing. You will save a lot of money just running regular gas unless you’re towing.Just my view on the matter.

The engine constantly adjusts to load, environmental conditions, and octane, but you are right that you wouldn't notice premium while cruising, though you may a moment later if you accelerate

 

[IconicXLTsport]

The engine constantly adjusts to load, environmental conditions, and octane, but you are right that you wouldn't notice premium while cruising, though you may a moment later if you accelerate

I drive like an old man so I never feel I load the engine enough to see the benefit of anything above 87 Oct unless I’m towing or hauling near max payload.

 

[AnthemMike]

Yeah my cousin has a 2.7 EcoBoost where I have the 3.5 EcoBoost, both 2021s. I'm running 91 premium just like you are after the dealership filled gas ran out. These gas prices, regardless how good our jobs are, is just insane! Since Thanksgiving, its been going up a little by little. We're thinking of switching to 87 when the 91 finishes. Not sure if its a good idea?

I only run 87 in my 2.7 but if I'm planning on doing some weekend towing I ensure I put premium in it. Other than that 87 all the time and I only fill up with chevron gasoline. If I cannot find chevron it's Shell and that's it.

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