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It might not sound like a performance engine to you, but it kind of is. It pushes 100hp per liter. Take a Corvette ZO6 with 505hp. Devide 505 by 7L and you get 72hp/L. I`m pretty sure a Civic Si needs premium and most hot hatches as well.
With the ECU systems these days, you should be able to run regular and not do damage to the engine, unless you push it hard as it should sense detonation and work with the ignition, cams and fuel parameters to get rid of detonation. You will hurt the performance and fuel usage with regular, but if you`re stuck, regular should not kill the car in one single tank. Just don`t hit a racetrack with a tank full of regular.
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