What gas octane???

Octane requirement is determined by the engine's compression ratio. Higher octane gas resists 'knocking' better in higher compression engines (the higher compression, the more energy you get out of the gasoline when you burn it). Truck engines are notoriously low compression to avoid 'knocking' (too-fast combustion that has the combustion chamber flame-front striking the piston face before it has begun it's downward travel making the distinctive noise) when pulling a heavy load. Higher octane gas contains no more 'power' than lower octane and only helps when you have an engine with higher compression to match (which can be achieved by adding turbo or supercharging). All RV engines do just fine on low octane gas. Anti knock sensor are installed to minimize detonation when the engine is heating up from heavy use.