I would say always go for 92/93 on premium cars, don't cheap out on gas. If you want to track down, try getting fuel that doesn't contain ethanol
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Originally Posted by KayTees
Mine says Minimum 89 but in Canada, I tried a little experiment, I put in a maybe a bar Chevron 94, drove it around and it felt normal, put Shells 91 and I drove it around for a bit, it felt sluggish and completely different. That's just me tho, the proper way is to probably dyno it.
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I completely disagree with you, the Chevron 94 simply doesn't feel up to par as Shell's 91. From my personal observation, the Chevron 94 in BC get an average of more than 35kms less of range from a tank and it doesn't perform as well on track. I know someone with a M4 who get around 5mph slower trap speed in the 1/4 at castrol on 94 compare to Shell 91. He also works for a machining company that does servicing for the refineries and says that Chevron's standards is simply not up to par compare with the others