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Discussion Starter · #1 ·
I've heard mixed reviews on the forums (from googling) on what gas to use for the ST.

I understand 93 Octane is best for performance as it keeps the full HP of the car, while using 87 drops it about 8 HP.

I just got my car, and im mainly using it to commute to work and back (50 miles a day) mostly on the northway.

I kinda dont feel comfortable using 87, as im worried it could hurt my engine/car in long term. Im wondering if 91 is a better bet as i dont need the 93 and the gas milage difference isn't worth the extra price.

Also, all gas stations around my area use ethenal.

What are your guys opinions?

Thanks!
 

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Discussion Starter · #21 ·
Thanks for your opinions guys. I filled it up with 89, because i looked at the price of 93 and it was over 50 cents more a gallon compared to 87. Being in the winter, I wont be romping on it as hard... and yes it would only be 100$ more a year, but is it really necessary? I am not sure. I honestly think i've noticed a difference in power from using 89 to 93. (93) was put in the car when i got it. But it could just be in my head.

I am averaging close to 26MPG, mostly highway right now. I havent been that frugal on my shifts though, typically shifting between 2-3 rpm. (I just got the car im not going to drive it like a grandma)

I want to use 93, but I feel like it might be a waste of money in the long run. What im going to do, is next tank, going to fill up with 93 and see if there is a difference in mileage. If its more than 2mpgs, I might just stick with 93
 

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Discussion Starter · #26 ·
ALL fuel is garbage in the winter. Stations change blends every 3 months (aligns with seasons basically) and in the winter it's super bad. Put 93 in your tank and you car reads it as 89-87 because that's how much octane is actually in it. Don't remember the exact reason off hand, but it's bad stuff.


Edit: If you got your car brand new, it'll get better MPG after a while from what I hear. Also, expect MUCH better mpg in the spring/summer. Mine is down 3-6mpg. This isn't just for our cars either. All cars will suffer from it if you pay attention. My supervisor at work who knows little about cars said the other day "this winter gas is killing my gas mileage with my v6."
If thats the case, im going to use 93 in the winter, and might go to 87 or 89 in the spring-fall
 

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Discussion Starter · #36 ·
oh man... here we go with the octane wars again.

If your bone stock, yes you can safely and continuously run 87 octane without any issues. I've done it for many many miles before getting tuned.
You will lose top end power, but maintain the same torque. You will not have the crazy insane knock knock boom nightmare everyone is saying. The engine will begin to retard timing before any serious
knock occurs thus losing steam past 5k.

Remember guys this is the EB from the 2.0 Ford Fusion, it was intentionally and originally designed to safely run 87.

If you want to run 93, you can do so for improved performance if you are stock. When you are tuned run exactly what your tuner recommends or else your engine says the phrase every terrorist says in their final moments and then explodes.

In-fact even more so if you are stock, trust exactly what your ST supplement/engineers say over everyone's opinion here, like mine that carries no weight or substance. Two people to trust are your Ford Engineers and respective tuners. Everyone elses opinion on here, including mine is invalid. I'm just referencing the ST supplement and Tuner recommendations.
Simple enough lol?
Good response, however it isn't simple for me... If the gas mileage is better in 93 octane, i would be tempted to use that just because i feel its better for the car (even though i guess it technically doesnt matter) but it makes me feel better running the best fuel in the car, however if the gas mileage doesn't really improve i wont use it
 
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