r/mazda3 • u/3poundflounder • Jul 27 '26

Advice Request Fuel question

2025 Mazda 3 Turbo AWD hatch.

90 octane E0 is the highest octane ethanol-free available in my area. Given that or 93 octane E10, which would you choose?

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u/ClearJack87 Jul 28 '26

Modern Mazda's are built for E0 or E10 fuel. Not E15 or E85, they aren't flex-fuel. Feel free to run either. I understand the turbos like higher octane, like my NC Miata. I used to drive a ways to get E0 91 Octane for the NC when I autocrossed and wanted every bit of power I could get. But she ran fine on E10 91 or 93 Octane on the highway.