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The engines of these cars are tuned for American 91 octane because "regular unleaded" in Europe is 90-91 octane. Anything but 91 octane (including 93 octane or 87 octane) will cause a reduction in every measurable performance charichtaristic of the car.
Americans use the Anti-Knock Index, and Europeans use the Research Octane Number to measure the octane of their gas. Regular unleaded in Europe is therefore 95 octane because they use a different scale.
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