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For my car (2018 Civic Si), Chevron 94 runs better than Shell 91.
I run an E10 blend with a fairly aggressive OTS tune (24.5 psi + ~30 deg. adv. timing) and monitor stuff daily.
Even blended with ethanol, my car detects minor knock on Shell 91 while my car warms up; it never does that on Chevron 94. That knock goes away once warm though.
Here's how I rank gas in the lower mainland for my car (determined by knock readings):
Chevron 94 E10 blend > Shell 91 E10 blend > Washington Shell 92 > Co-op E10 blend > Chevron 94 > Shell 91 > Costco 91 >> Petro 91 (car hated this stuff, possibly bad gas)
As already stated, Chevron 94 can be inconsistent. It seems like 1/5 tanks isn't as knock resistant as the others.
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Last edited by boibuddha; 12-04-2020 at 05:35 AM.
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