no.

 

Why?

 

Why no? Or why would someone run 87 octane in a turbo'd engine? I agree to that why question. Per the manual and on the gas cap, premium unleaded gas only.

 

You should run the premium fuel offered in your state. 91acn, 91, or 93. If you are one of the lucky few with higher, e10 or less, AKI fuels you don't have to buy it, nor should you.

 

93 Shell .

 

Read your user's manual please.

 

I’m running 91 in our ‘22, but interestingly enough, the manual says regular octane is ok. Likely new with the ‘22 and guessing because the motor is shared with the legacy and ascent which also allow regular gas.


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It does go on to say you may notice slight decrease in performance, fuel efficiency, or notice slight engine vibration or knocking. If knocking is heavy, it says return to 91.


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It reads that 87 octane is OK in a pinch. Not that you should be purposefully putting 87 octane into the car when higher octane is available.

 

Zax is correct. Although 87 will work, Subaru recommends 91 or higher.

 

Zax is correct. Although 87 will work, Subaru recommends 91 or higher.

Yup. Only interesting point I think is that they say nothing detrimental and no impact to warranty. Which I thought I heard was new for ‘22. Was more strict before. Either way, 91, this is the way.


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Subaru has unnecessary confidence in their knock control system apparently.

It is far more aggressive on the FA platform.

 

93 Octane Shell (first) or Sunoco (second).

 

I don’t have a lot of options so Petro Canada 94 is what is in my WRX…

 

Gas is usually 87 or 93 by me, so it gets a few gallons of 87 when I gas up and It still averages 92.

 

What a strange thing to do? Why get the car if you are going to cut corners to decrease performance and safety margins just to save a few bucks? Think of how much you could save if you used conventional oil or extended you oil change intervals by a couple thousand miles.

 

Costco 93 baby

 

93 Octane!! Shell (first), Sunoco (second).

 

Let’s do some math:

Let’s say you average the city/highway EPA estimated 22mpg over a standard 12,000 mile year. You will burn 545.45 gallons of gas.

In my area, premium is usually 40¢ more per gallon than regular gasoline.

So, how much more a year are we spending over the course of a year? $218.18….

And it’s actually probably less than that as regular will diminish some performance.

So over the standard month (assuming we can amortize our mileage evenly) we are talking $18.18 extra in gas each month.

Why are we talking about this? If you cannot afford an extra $20/mo in gas you cannot afford the car.

If only regular is available in your area… It’s your money to buy whatever car you want with, but maybe a turbo 4 cyl shouldn’t be it? Or, your gas station or auto parts store may sell an octane booster you can dump in with every fill up…

Either way…. If you cannot afford to feed this car quality gas in the best octane available in your area you cannot afford to own the car. “Best” octane may vary by region (usually 91-93) and is can vary due to many reasons (such as elevation). It’s so easy (and not expensive) to just put in the best quality… so why not?