PoCoBob
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This is a cut and paste from here https://www.jbimportauto.com/blog/does-higher-octane-fuel-boost-your-car-s-performance
Fact vs. Myth
The fact is, the difference in gasoline octane levels has nothing to do with the stored energy in the fuel. Octane ratings pertain only to the pre-ignition (ping) caused by modern high compression motors. Using higher-octane fuel than indicated will add nothing to your vehicle’s performance or its gas mileage. It won’t make it run any smoother either.
I seem to remember reading somewhere that 87 actually has more stored energy per gallon than 93 does. So if you took a gallon of 87 and a gallon of 93 and threw a match into each of them the 87 would make the biggest bang (please don't try that). But because the 93 can be compressed more is why it can yield more power. So using the lowest octane that can withstand the compression your engine has (without the engine detuning itself) would be the right fuel to use.
Fact vs. Myth
The fact is, the difference in gasoline octane levels has nothing to do with the stored energy in the fuel. Octane ratings pertain only to the pre-ignition (ping) caused by modern high compression motors. Using higher-octane fuel than indicated will add nothing to your vehicle’s performance or its gas mileage. It won’t make it run any smoother either.
I seem to remember reading somewhere that 87 actually has more stored energy per gallon than 93 does. So if you took a gallon of 87 and a gallon of 93 and threw a match into each of them the 87 would make the biggest bang (please don't try that). But because the 93 can be compressed more is why it can yield more power. So using the lowest octane that can withstand the compression your engine has (without the engine detuning itself) would be the right fuel to use.
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