Should I run 87 or 89 fuel in my 2017 Silverado 1500 5.3L?

[Jmiller11331]

Does it matter if I run 87 or 89 in my truck? Better mpg? Anything?

 

 

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[duquephart]

General consensus is that the truck will run a bit better on 89.

[Orlando8]

I see absolutly no difference between the two

[cjd10]

Mine definitely runs better on 89. I have tried 93 and can't really feel much difference between 93 and 87.

[diyer2]

I believe the owners manual specs 87. Use a name brand Top Tier gas of your octane choice.

[Arth]

This is a rabbit hole you will never climb out of. Personally I know these are higher compression engines thanks to direct injection and 89-93 provides a bit better knock protection. People will say the computer will compensate for knock at 87 octane at the cost of a little power we won't notice.

 

As said above I run 93 and my truck seems to run smoother than it did on 87.

[Donstar]

duquephart came to the same conclusion as I after reading lengthy threads previously posted on this topic. I run 89 in my 4.3. You probably won't "notice" a difference but this really doesn't matter. How many notice a difference between brands of oil? Most of us like to know we're doing something we feel is a little better for our trucks and there is evidence that this may help!

[Boardmember]

I run top-tier 89 in my truck and it delivers the advertised mpg and doesn't knock.

 

I used to run top-tier 87 in my truck and it delivered the advertised mpg and didn't knock.

 

See Donstar's comment above. I think that's the answer. For me, anyway.

 

Hell I feel guilty when I get lazy or cheap and allow the service Dept to use house-brand Dexos oil instead of an advertised "premium."

[Loco-diablo]

Only filled up twice so far but have been using top tier 87. Running fine. I always avoid no name fuel. Some say it's all the same but I don't mind paying the extra .5 for Sunoco.

 

 

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[Supere]

I've seen numerous articles and videos that say your just wasting your money unless it's suggested by the manufacturer..

[Donstar]

I believe it is a personal decision. You can find articles slamming most choices. My research led me to the conclusion that running 89 octane is not a waste of money. It may not be a necessary expense but you could argue a truck isn't a necessary expense for most!

[Jmiller11331]

Thanks guys

 

 

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[Boardmember]

I'm too lazy to verify this is 100% exact, but the Owners Manual says something like "no less than 87 octane."

 

I think we equate the more expensive with better quality.

 

I recognize the arguments and for now am running Exxon or Chevron 89. About $.30/gal more and I drive a lot. I don't think I would ever run 93 - for all the reasons folks here don't run 89.

 

If I were averaging 15mpg instead of 18-19mpg and gas was $4.00/gal, I am positive I'd be back to 87.

 

Top tier. That's the take-away. No Chinese tires either.

[cbrsilv15]

I ran 93 through the tank a couple of times and noticed absolutely nothing. Same noise, same MPG's and same power.

[FL335i]

I run 87 just tolling around town empty. When towing 93. I run 89+ in the K5.