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I should point out that our RON 98 (eg BP ultimate, Shell V-Power) is the SAME as your 91 or 93 octane...just branded differently. Its like 62 miles per hour = 100kmh same speed, different number.
There are various fuels and products to increase the octane rating of your fuel (eg racing fuel). Octane rating is the resistance to premature ignition of the fuel (detonation). Using a low octane fuel on SOME high performance engines such as our, the engine management will retard the timing to avoid detonation(pinging) and therefore lose power. Using the recommended fuel or above will avoid the engine managements need to retard the timing.
This does not mean you will gain extra power from your naturally aspirated engine. Running a higher octane fuel is popular on forced induction (eg turbocharged) cars. A higher octane fuel will let you advance the engine timing further (assuming you have necessary equipment to do this) with less risk of engine damage compared to running a lower octane fuel.
Higher octane does not mean better combustion.
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