Quote:
Originally Posted by MightyMouseTech
The higher octane is mostly needed at steady highway cruising when the engine is trying to run as lean as possible, and running at its highest temperature.
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This is counterintuitive. It is the lowest load, so low octane should give the best bang for the buck. Lower octane fuel is actually giving a better BTU than high octane fuel. High octane allows for a more advanced ignition, so more power.
https://www.appropedia.org/Energy_content_of_fuels