87 vs 91

valench22

Jan 25, 2022

Just curious on which gas most are using? Expecting my Base Sasquatch
This week & wanna start with the 91,
Unless the consensus is: 87 is
and no real need fir 91 plus. TIA

Last edited by a moderator: Jan 25, 2022

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Jan 25, 2022

It was my understanding that the compression created by the turbos required a high octane for better gas mileage and less wear and tear on the motor. I’m coming from the 2.0 Liter turbo jeep motor and I only used 91 octane. I plan on only using 91 octane on my Bronco.

Jakob1972, valench22

Jan 25, 2022

I have been using 87 octane with my 2.7. So far I have 3,035 miles on it.

2021 Badlands, 4 door, 2.7L, Auto, LUX, SAS, Tow Package, MIC, Velocity Blue.

NickP, bdawson24

Jan 25, 2022

I use 87.
Have gone with (2) tanks of premium and did not see any gas mileage gain from it.

I'll toss in a tank of premium here and there, or if I plan on towing my trailer long distance. Other then that, it will be regular for me, gas too damn expensive right now, and 17.3 mpg isn't helping my commute any.

2021 Broncos - BaseSquatch 4dr. Rapid Red V6 Soft Top
Big Bed 4dr. AMB V6 Soft Top Tow (BIL's)
Nitto tires SUCK! You've been warned.

SlashRacer

Jan 25, 2022

the ecoboost engines are designed to run on 87 with the ability to produce more power with premium fuel

JJACK502, Calgecko

Jan 25, 2022

These motors are pretty flexible. I use 91 in my Focus ST and Bronco and occasionally 87 if the price gets too high.

I’ve even put 85 in my wife’s Expedition 3.5L eco boost. She drives it like a grandma.

2021 badlands, 2.3, MT, rapid red, soft top

TechnicalDisaster

Jan 25, 2022

my wife always puts 85 in our 3.5 ecoboost Flex she's too cheap to buy premium it has 200k and still runs great

TechnicalDisaster

Jan 25, 2022

Here's what the manual says about it.

Do not use 85. I'm sticking with 91.

JJACK502, Bschurr

Jan 25, 2022

I use Premium.

Bronco Nation Member #0000
Instagram: bdawson24

NickP, Jakob1972

Jan 25, 2022

93, I want all the power

youre from NY, go 93

2dr Badlands 2.3 Manual w/Mid, Rapid Red
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Bschurr, Jakob1972

Jan 25, 2022

#10

Speed Devil
93, I want all the power

youre from NY, go 93

Well, "Speed Devil" is your name so it makes sense!!! :ROFLMAO:

Bronco Nation Member #0000
Instagram: bdawson24

Speed Devil, SlashRacer

Jan 25, 2022

#11

if you want the horsepower that is advertised for your engine - use 91. If you're willing to lose maybe 10-15 hp, 87 will work for you

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Jakob1972

Jan 25, 2022

#12

Calgecko
if you want the horsepower that is advertised for your engine - use 91. If you're willing to lose maybe 10-15 hp, 87 will work for you

There you go keeping us all in check. lol :LOL:

Bronco Nation Member #0000
Instagram: bdawson24

Speed Devil

Jan 25, 2022

#13

bdawson24
Well, "Speed Devil" is your name so it makes sense!!! :ROFLMAO:

Still, who the hell drives slow? Even if I had this, I'd be fast

Also, 91? Only place I ever see 91 in the area is Wawa

2dr Badlands 2.3 Manual w/Mid, Rapid Red
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bdawson24

Jan 25, 2022

#14

in CA, the highest octane we can get is 91, unless you go with E85

Speed Devil

Jan 25, 2022

#15

Vehicle can handle 87. However you get both more torque and hp from 91. Further anyone familiar with these engines knows 91 is what you want to burn to get both the best performance and longevity out of these engines. Unless there is absolutely no choice, I don't and won't ever burn 87 in an ecoboost engine.

Ford knew it would be an issue to require 91 octane in all of its ecoboost engines, but 91 produces more power and allows the engine to more efficiently combust. Long term 91 should provide better engine longevity. It's also why you can get engine ping with 87 octane.

https://askanydifference.com/differ...ency of 87 octanes,pinging than 91 octane gas.

Speed Devil

Jan 25, 2022

#16

TechnicalDisaster
It was my understanding that the compression created by the turbos required a high octane for better gas mileage and less wear and tear on the motor. I’m coming from the 2.0 Liter turbo jeep motor and I only used 91 octane. I plan on only using 91 octane on my Bronco.

You are correct. Those using lower octane are rolling the dice. Especially on long term wear and tear.

TechnicalDisaster

Jan 25, 2022

#17

If you're leasing and don't plan or care about keeping it long term, do 87 and do the recommended 5-10k oil changes, otherwise 91/93 and 3k, since who the hell really thinks it'll last that long?

2dr Badlands 2.3 Manual w/Mid, Rapid Red
My blog, Mfcomics.net, my stories: https://payhip.com/MFComics

bdawson24

Jan 25, 2022

#18

91 I've done test after test, better power no ping and better mileage.

Plus if you have the Exxon Mobil Smart card starting Feb 1 you get 12 cents instant savings on premium and 10 cents on bilge water

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Speed Devil, bdawson24

Jan 26, 2022

#19

Thxs Everyone! Great feedback!
I’m actually buying (not leasing)
& since wfh last two years, don’t
Really drive that much. My 2020
Jeep Wrangler had 14k miles.
I’m gonna go w the 89-91 &
see how-it-goes. Thank U All &
Be Safe out there! Peace!

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