What does your manual require? If it’s 91 you should not be putting anything less in it unless it’s an emergency.With gas prices on the rise and the difference between midgrade and premium being around 40-50 cents, anyone out there running midgrade or alternating between 89 and 93? Can you feel hp decrease, or any pinging or knocking?
The discrepancy here is that the CVT cars can run regular. The manuals need the good stuff. When in doubt check your gas cap. Theoretically if you were dead set on running regular, you could add meth/water injection and be good to go. However as others have stated, dont be stupid. .50 per gallon is a lot cheaper than an engine replacement.Subaru is not really consistent with their wording when it comes to this subject.
From the 2016 brochure:
“Premium unleaded gasoline recommended (91 octane required for STI, 93 octane for maximum performance).”
From the 2017 brochure:
“Premium unleaded gasoline (91 octane) is required. 93 octane recommended for maximum performance.
WRX only: Regular unleaded gasoline, 87 octane may be used.”
From the 2018 brochure:
“Premium unleaded gasoline (91 octane) required. 93 octane recommended for maximum performance (WRX STI).”
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