If folks tuned their engines ( along with altitude, temp, usage at their location) by BTU, instead on Octane, a real feeling for whats going on inside would make tuning more accurate if you are going for details.
Octane, like Cetane, is a Flame Retardant. This " Can" , with dense fuel , make more power.
Alcohol has a higher Octane, but its a puke on BTU, much less power. So in modern fuel with Alcohol it can be misleading when compared to Suncoast 260 of the past.
Octane doesn't always mean better, or more power in the case of Ethanol.
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