Originally Posted by
steve_t
An engine will make the most power for the fuel it is tuned for. Engines with knock sensors can advance timing to get more power until they detect knock. If the engine can advance its timing sufficiently to take advantage of a higher octane's ability to prevent knock, this will yield the most power. Higher octane fuels usually have a higher energy content per litre
Pretty much. It depends on what the vehicle is tuned for. Modern fuel injected motors compensate for different octane ratings and may or may not benefit from the higher. My C50T definitely seems to run better on 98 and in particular Gull's 98 blend so I use that whenever I can source it.
Unless your bike is tuned for it, probably better to go with 91. Our Nissan Pulsar also seems to run better on 98, but it's hard to tell for sure without doing a dyno test.
You don't get to be an old dog without learning a few tricks.
Shorai Powersports batteries are very trick!
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