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Observations on 87 Octane Fuel and 91+ Octane Fuel

Frenchy

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Putting this in the general since it will relate to more than just the Ranger.

This will simply be about some observations I have taken with the 2019 Ranger and the 2012 Frontier on how they act with 87 and 91 Octane Fuel.

For what it's worth we already know that there are plenty of arguments about weather one should use Premium Fuel(aka 91-93) in their vehicle. Well I won't argue that there are plenty of vehicles out there that will not benefit what so ever and there are vehicles that actually do benefit from. What are those benefits? Those benefits will include better engine performance(to an extent), smoother idle(assuming there isn't a major problem with said engine) and better Fuel Mileage(assuming you are driving for such).

First we have the Ranger. With the 2.3L EcoBoost the Engine can certainly benefit from these and I have seen it myself. In the Owner's Manual it will state to not run fuel with an Octane Rating below 87. It also states "for better performance and towing to use Premium Fuel". When I first got my Ranger I was using 87(what Midgrade is here in Colorado and other states). About a month later I went to Premium(91 here in Colorado and many other states). The first thing I noticed was the better performance. I'm not taking a difference of 100 HP, but smoother and fast acceleration like the Engine was not Pinging. Hard to say of the idle was smoother of course. Later I did notice the improved MPG(by about 1-2 if memory serves me right). Overall with those three combined, it was certainly an interesting thing to observe.

Now for the Frontier. In the Owner's Manual it states to run 87 AKI or 91 RON. For reference that means 87 here in the US and Canada. Across the world it would be 91. Previous years would recommend 91 for better performance like what Ford does with the Ranger and other vehicles. That said many would claim no difference. Well today I decided to have fun and experiment.

Keep in mind that my Frontier is heavily modified in terms of performance and OffRoad Capability. It is heavy, but the extra performance parts help along with a tune. The tune is set for 87 since that is what the truck calls for and it made sense to me. Well after running 91 in it, I noticed that the truck certainly idles smoother and the power output has improved(most likely due to pinging from the heavy load). Due to this it is certainly possible the MPG can go up, but it has yet to be run long enough to say for sure. Regardless it was certainly interesting to see especially since the truck only calls for 87.

With that said I know many will want to talk about $ per mile vs the miles per gallon. If that is your concern, then go buy an economy car meant to max the $ per mile ratio. Don't want to do that? Then suck it up since you got a truck.
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subquark

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Informative write up @Frenchy , thanks!

I've always run the highest octane at the pump. Here in New Hampshire, I get 93 (but it always has ethanol).

I run it because my dad always told me to and he was a Chief Engineer in the merchant marine.

I know it helps reduce pinging, but that's all that I am quasi-certain of.

All my extra HP comes from the damper, 303 Graphene, and the narural boost that comes from frequent dump runs!

Yeah, baby, yeah!
1751858360139-lb.webp
 

Dgc333

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FWIW, I am coming up on 50k miles on my 21 Ranger. The first 12k or so miles I ran 93 with the Ford Performance tune. When 93 broke the $4 a gallon I switched back to 87 and have been running 87 ever since (I do use 93 when towing our camper).

I do not notice and difference in smoothness between 87 and 93. The mpg is the same between the 87 and 93. There is a difference in power between the two octanes but it is predominately above 4000ish rpm where I seldom drive the truck.
 

Friday yet?

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93 only since I picked up the truck. So can’t compare.

Will say my Focus ST (2.0 L) states right in the manual, 87 = 240 HP, 93 = 252. No change in torque. Would have to assume similar results for the 2.3 liter. When the ST was my daily it got fed 93 only. The warden DD’s it since we got the Ranger as she wanted the stick. (Knew I loved her.) She’s been known to fill with 87 and 89, though I keep (gently ?) asking her to only buy 93.

That said, I’ve never dogged the ST while running 87 so can’t speak to seat of the pants feel.
 
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Dgc333

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93 only since I picked up the truck. So can’t compare.

Will say my Focus ST (2.0 L) states right in the manual, 87 = 240 HP, 93 = 252. No change in torque. Would have to assume similar results for the 2.3 liter. When the ST was my daily it got fed 93 only. The warden DD’s it since we got the Ranger as she wanted the stick. (Knew I lover her.) She’s been known to fill with 87 and 89, though I keep (gently ?) asking her to only buy 93.

That said, I’ve never dogged the ST while running 87 so speak to seat of the paints feel.
FWIW, Ford advertises the HP for the 2.3 in a Bronco with 87 and 93. If I recall correctly it is 285 and 315. Not sure why they don't for the Ranger other than marketing doesn't think the target market for the Ranger cares.
 


NotBudule2

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My truck drinks from the top shelf, as do I... and both of us can tell the difference...
The higher octane in the truck has COMPLETELY ELIMINATED THE NEED FOR A TAILGATE DAMPER ! and probably has some other benefits as well...
 

Cabose-1

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I run in the middle. 89 octane. When i tow for a very long distance, cross country from texas to texas, i use 92 octane. Big difference between this and 87 octane. Can feel it in loads and trailering.
 

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Early on I ran several tanks of everything and tracked the mpg.
I averaged 1.5 mpg better with 89 over 87, enough that it doesn't cost more in the end to run 89. It felt smoother too.
No change in mpg with 93 over 89.
Mostly I run E15 88 though because it's 60 cents less than 89. At most 0.5 mpg less than 89.
I burn a tank every 5 days so for me it adds up, even getting 20 mpg.
If I can't get E15 88 then I get 89.
 

NotBudule2

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My truck drinks from the top shelf, as do I... and both of us can tell the difference...
The higher octane in the truck has COMPLETELY ELIMINATED THE NEED FOR A TAILGATE DAMPER ! and probably has some other benefits as well...
WE DONT DRINK AT THE SAME TIME!!!
if that's why I got the angry face ?
If it was about the dampers, ehhh...
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