What fuel octane rating is used for the 8.1 engine?

The 8.1-liter engine, commonly known as the GM Vortec 8100, typically requires a minimum octane rating of 87 (regular unleaded gasoline). However, for optimal performance and to prevent knocking, using fuel with an octane rating of 89 or higher is often recommended. Always consult the owner's manual for specific fuel requirements for your vehicle.