RON stands for Research Octane Number. It measures the fuel knocking resistance in spark-ignition internal combustion engines.
Knocking is what happens when the air-fuel mixture prematurely ignites before the flame from the spark plug can reach it, thus rendering loss of power. Heavy and prolonged knocking can cause vibration which in turn may damage the engine.
RON95 is a fuel that possesses the same anti-knock rating of a mixture of 95% iso-octane and 5% heptane. If a vehicle is filled with a lower octane fuel than is required by an engine, then engine knocking may result.
It is a misunderstanding to think that RON97 fuels produce more power than RON95 fuels, even more so with the fact that in reality a higher RON number means the fuel burns less easily!
RON refers to the ability of the fuel to resist knocking and nothing else.
Use RON95 for more power and better efficiency.
By pumping the RON97 into a car which engine only requires the RON95, all you get is an emptier wallet.
Engines are designed to have a minimum RON rating for its fuel. Check your service manual for the minimum RON rating that it requires.