Yet another method may be the Motor Octane Range (MON), which happens to be also completed in the lab by operating the test fuel within an motor at a better temperature and rpm, when various ignition timing. One more variable to consider will be the Reid Vapor Tension (RVP) rating https://howtogeeks.co.uk/rev-up-your-engines-with-motorsport-supplies-your-ultimate-source-for-race-and-rally-parts-motorsport-components-and-race-fuel/