Premium fuel is recommended in the redesigned Silverado 1500 with the most powerful V8 option, which also happens to be the second-largest small block from the sixth generation at 6.6 liters compared to 6.7 for the LS6 of the Corvette. Internally referred to as L78, the dual-injected truck engine is listed with 91 or greater octane by Chevrolet in the owner's manual for model year 2027.
Attached below, said manual further confirms th... (continu…