I have been running the higher octane in my 2003 Yukon XL2500 from about 60,000 miles, I noticed a performance difference and slightly better fuel economy by constantly running 91. It now has 140,000 miles and have only had to replace the map sensor.
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1971 W30 convert, triple green,second owner.
1971 W30 Convert, special order Rally red, completed
68 Camaro Z28,Corvette Bronze,Houndstooth
2016 Porsche Carerra Cab and 2021 C63S AMG ,modern fun.
www.vancouverclassiccars.com
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