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Gasoline note:
The US measures Octane in "AKI" (anti-knock index), or explicitly "(R+M)/2". AKI is the average of the RON (Research Octane Number) and MON (Motor Octane Number, a different test) octane ratings. The MON tends to be 8-10 "points" lower than RON for the same batch of fuel, so the US pump rating will be 4-5 points lower than the RON rating.
Your 91 RON is ~87 AKI, which is regular-grade fuel in most areas of the US.
Your 94 RON is ~89-90 AKI, which is mid-grade fuel in many areas of the US.
Premium fuel would be roughly 96-98 RON.
-soD
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