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But depend on the car. Some of the car may not feel the different (Come of Euro Brand).
However, My car can feel the different.. The turbo meter can tells me the answer because I have tried once Esso Super and my turbo meter shows me that the turbo can only up to 0.5 bar(normally 0.9) and stop. It means there are some incomplete combustion so the computer set to protection mode. Other brand have no such problem.