ORIGINAL: ghoffman
No, the energy content is the same, regardless of octane. However, 100% gasoline has about 4.5% more energy than 90-10. If we could buy 100% 87 octane gas, it should be the same as the NASCAR gas on a relativity low compression engine like this.
It should work similarly to the 100 Octane Aviation gas I used several months ago. The engine timing retarded enough (slow flame propagation) to make the engine appear to run fat.
BUT I really would love to hear if it runs differently on gasoline intended for surface vehicles. AvGas has additives for high altitude runs that should not be required in gasoline intended for ground runs. Please report here
Thanks