Per GM................
For high-performance vehicles that require premium fuel (91 octane or higher), fuels of at least this octane must be used. Using lower octane fuel may result in reduced performance, knocking, and/or permanent engine damage that is not covered under the terms of the New Vehicle Limited Warranty.
Using higher octane fuels in a vehicle that only requires regular unleaded fuel will not increase performance or improve gas mileage. Only use the octane-rated fuel recommended as specified in the vehicle’s Owner’s Manual.
I have owned a GMC with 6.2L engine since 2012 and I never resorted to anything less that 91 which is the norm in this area. I suppose if you plan to trade it in every so many years, let the next owner deal with any engine damage that could result from long term use of low octane fuel.
For high-performance vehicles that require premium fuel (91 octane or higher), fuels of at least this octane must be used. Using lower octane fuel may result in reduced performance, knocking, and/or permanent engine damage that is not covered under the terms of the New Vehicle Limited Warranty.
Using higher octane fuels in a vehicle that only requires regular unleaded fuel will not increase performance or improve gas mileage. Only use the octane-rated fuel recommended as specified in the vehicle’s Owner’s Manual.
I have owned a GMC with 6.2L engine since 2012 and I never resorted to anything less that 91 which is the norm in this area. I suppose if you plan to trade it in every so many years, let the next owner deal with any engine damage that could result from long term use of low octane fuel.
