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2021 Kia K5 GT
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Discussion Starter · #1 ·
Can't remember where I read it but, using premium fuel in the 2.0T gave about 10hp gain over regular fuel.
This apparently came from kis engineers.
Wonder if this applies to the new theta 3 2.5T engine. If so, this bumps up the hp to 300 +/-
 

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Likely no, not unless the computer has a map to take advantage of it. Usually you see this with E85. Will it hurt, no, will you get NOSstickeronthesidewindow like gains, probably not.
 

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Discussion Starter · #3 ·
From what I understand, the ecu detects octane and adjust timing accordangly.
According to manufacturer, we should use 87 0r higher.
 

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Higher octane fuel burns slower/detonates at a higher temperature resulting in higher overall power output per ignition cycle.
 
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