What gas octane rating is good for use on 2005 Yukon Denali?

For a 2005 Yukon Denali, it is recommended to use premium gasoline with an octane rating of 91 or higher. While the vehicle can run on regular unleaded fuel (87 octane), using premium can optimize performance and fuel efficiency, particularly for the 6.0-liter V8 engine. Always refer to the owner's manual for specific fuel recommendations.