What octane gas for Stihl chainsaw?

Stihl recommends using unleaded gasoline with a minimum octane rating of 89 (mid-grade) for their chainsaws. Higher octane fuels can be used, but it's unnecessary for optimal performance. It's also important to mix the gasoline with a quality two-stroke engine oil at the correct ratio specified in the user manual, typically 50:1. Always refer to your specific chainsaw model's manual for the best fuel recommendations.