* 5.7L V8: This engine typically requires regular unleaded gasoline (87 octane).
* 4.3L V6: This engine also typically requires regular unleaded gasoline (87 octane).
While higher octane fuel won't hurt the engine, it's unnecessary and a waste of money. Always check the owner's manual for the definitive answer specific to your Tahoe's engine. The information sticker inside the driver's side doorjamb might also list the recommended fuel type.