Originally Posted by willwren
There is no POWER in higher octane fuel. That'* a myth.
It'* a hard myth to dispell. For years marketing of "Hi Test" fuels sold the public on the idea that Octane = Power.
Adding some more to my earlier reply...
Reality is just the reverse. Octane'* evil twin Heptane is the power source in gasoline. The higher the octane rating, the less volatile the fuel is. It has more octane molecules compared to heptane. (or, in modern fuels, it has enough of other chemicals added to simulate having higher concentrations of Octane vs. Heptane.) High octane only helps support other modifications that do add power by supressing the nature of the fuel to detonate on it'* own before the spark commands it to.
Even high boost pressures can be hacked on pump gas, provided it is applied at a high enough rpm. (in other words, light the mixture off via spark before it has a chance to detonate on it'* own.)
The most powerfull engines that need octane rating in excess of 100... Aircraft engines. Huge pistons, long strokes, and big power outputs at low rpm.