Lifetime Fuel Economy - 6.2 liter engine

[humer101]

Premium from day one

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[hairscramlber]

I've tried both in my 5.3 and don't notice hardly any difference, surely not 50 cents a gallon difference

 

[abright52]

Do you guys run premium ??

Up until the last two tanks, it has always been 93 octane. I have recently started experimenting to see how it performs on 89 octane.

 

[Demer]

Do you guys run premium ??

Yep. Ever since I purchased it with 2 miles on the clock all it's ever had was premium.

 

[Illnasty]

I get 12.8 as per the information center in my 2002 Denali AWD. 260k on the odometer, leaks oil, and only regular gas.

 

[Doubeleive]

Do you guys run premium ??

I do 99% of the time unless premium price is stupid wherever may end up, pulled up to a station not long ago mid grade was like 2.69 premium was like 3.39, nope

 

[Big Mama]

No I run regular gas but fill with mid grade once a month.

 

[Big Mama]

I get roughly the same mileage as you posted. 17' XL with 11k miles. Just wish it had more power.

Easy add on for power. Start with cold air intake. You’ll be surprised how much it adds.

 

[humer101]

Easy add on for power. Start with cold air intake. You’ll be surprised how much it adds.

Do you have 6.2 or 5.3?

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[JWBGMC]

Do you guys run premium ??

I run the 6.2 on premium. Premium is recommended. When I used regular, I heard engine pinging. So I switched to premium. I buy the gas at Costco so it is sold as a decent price.