[42pilot]

It is possible. Octane is an indication of how gas will burn, not explode. The higher the octane, the more controlled the burn in the combustion chamber. Higher octane won't add HP, but it will keep the ECU from retarding the timing because there shouldn't be any detonation. In other words, you engine should be operating near max, given ambient temps are low and humidity is low. Low octane fuel will explode in the combustion chamber - exactly like small hammers tapping the top of your piston on each power stroke. One day, a hole will appear in one of the pistons at an inconvenient time.

Now ELF oxygenated racing fuel is completely different... Yikes.