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Owners manual recommends 93 octane

Chevyguy273
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newdude Senior Enthusiast

newdude

Posted
Posted (edited)

If you can find 93 with ease, use it.  If you can't, use 91.  Don't use 87 in a 6.2, you aren't doing yourself any favors.  If you want to use 87, get a 5.3 next time.

 

6.2 will get the best mileage and optimal performance on 93, next closest is on 91.    

Edited by newdude
Chevyguy273 Enthusiast

Chevyguy273

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I have actually found 2 nearby gas stations that sell 93 octane for what Sam’s Club sells 91 for. And believe me. I will never put 87 in this truck. I didn’t spend all this cash on the big bad 6.2 to cheap out on $5.00 or $6.00 at every fill up. 

Z45 Senior Enthusiast

Z45

Posted
Posted

I have always used 91 in my 6.2L Denali's as 93 is not available within 40 miles of my location.  Never had an issue.  I use either Shell or Murphy which are ethanol free here. 

ThatredneckguyJamie Enthusiast

ThatredneckguyJamie

Posted
Posted

Here in Jax some have 93, some 91, and some are 92...they all cost about the same so I try and get 93...never had any trouble or noticed a difference when forced to use 91

Back in Black AT4 Enthusiast

Back in Black AT4

Posted
Posted

I just picked up my 6.2L AT4 last Friday...during the test drive (cold start) it ran and idled perfect but was near empty (factory gas)...when I picked it up on Friday the dealer put a half-tank of 87 octane gas and the truck had slight trouble maintaining an idle...felt like a slight miss in the engine and also showed in the tachometer...I sat there setting up the truck features for about 30 minutes idling with no improvement in idle quality...I drove around the corner to the nearest gas station which had 94 octane...filled the rest of the tank with 94 octane and then it idled perfectly...I wouldn't want to risk putting 87 octane again...I know that the knock sensor would ****** timing if it detected knock and reduce engine performance, but I'd rather pay a bit more for better fuel...probably go 91 next fill up though as 93/94 octane is expensive...

Ezekiel2517 Enthusiast

Ezekiel2517

Posted
Posted

Im sure Ill get flamed but I run 89 Octane all the time in mine when putting around town.  I cant really tell the difference in power or mpg.  I run 93 when towing though. 

 

Been interested in trying the e30 cocktail that was mentioned on another thread here, but E85 is hard to find

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