What is the best fuel type to use on a Chevy Tahoe?

The best fuel type for a Chevy Tahoe depends on the model year and engine. However, the vast majority of Chevy Tahoes are designed to run on regular unleaded gasoline (87 octane). Check your owner's manual; it will explicitly state the recommended fuel octane rating for your specific vehicle.

Using a higher octane fuel (like mid-grade or premium) won't harm your engine, but it won't provide any performance benefits unless your engine is specifically designed for it (some high-performance Tahoes might be). You'll just be wasting money. Using a lower octane fuel than recommended *can* cause problems, potentially leading to knocking (pinging) and engine damage.