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How do some members in the forum figure whether vehicle requires 92 or 95 octane based on the compression ratio?
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Actually Premium/HighOku ranges from 95 till 98 (ish). Depending on the fuel manufacturer. Nowadays the common premium is 98 except for a few budget brands which are 95ish. Then some manufacturers do the whole "special additive" marketing which in some cases would increase the octane value as well (as some were octane boosters).100 is still reserved as Ultra Premium (which previously/used to range from 98 upwards) and actually not that widely available even with the larger brands. But the notion is that things are going to stagnate at these octane levels for now as most manufacturers are on a frenzy to put on hydrogen stations because of the deadline.
So depending on the car (its period to be more specific) even 95 as "premium" would suffice.
@tiv what sort of compression ratio is considered as high compression ratio?