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

Jmiller11331

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ChevyRoofer Senior Enthusiast

ChevyRoofer

Posted
Posted

Top Tier does not refer to octane rating. You can buy top tier 87, 89 and premium.

 

Correct, the comment on engine compression deals with the octane rating.

 

The link about top tier gas was a response for Sage55.

  • 4 months later...
FIREBLADE74 Enthusiast

FIREBLADE74

Posted
Posted

If I’m not mistaken those gas tankers have sealed compartments, so the same truck may have 3 different kinds of fuels onboard.

 

What makes me wonder is if the driver ever put the wrong fuel in?

2017SierraSLT Senior Enthusiast

2017SierraSLT

Posted
Posted

The main thing for fuel economy is to purchase non-ethanol fuel if you can find it. I run 91 octane non-ethanol, and my old '13 and my current '17 seem to like it.

  • 2 weeks later...
steve76t Enthusiast

steve76t

Posted
Posted

Saw this thread and thought why not?  Tried 3 tanks of 91 octane in my 5.3L & gas mileage went down compared to the 87 I was running.  On 87 I was averaging about 17.5mpg in mixed driving, 60% city/40% hwy.  With the premium grade 91 octane, mileage went down to 15.7 on my last tank with the same basic mix of driving. 

 

I've now got mid-grade 89 octane in the tank.  Will run a couple tanks this way to see if there's any change.

'17 Sierra Enthusiast

'17 Sierra

Posted
Posted
14 hours ago, steve76t said:

Saw this thread and thought why not?  Tried 3 tanks of 91 octane in my 5.3L & gas mileage went down compared to the 87 I was running.  On 87 I was averaging about 17.5mpg in mixed driving, 60% city/40% hwy.  With the premium grade 91 octane, mileage went down to 15.7 on my last tank with the same basic mix of driving. 

 

I've now got mid-grade 89 octane in the tank.  Will run a couple tanks this way to see if there's any change.

I was running 89 all the time until I realized that I wasn't getting Top Tier. I've been going to Costco lately and they don't have 89, just 87 and 92 so now I'm on my 2nd tank of 92. I used to feel surging (like when accelerating on an on ramp) with 87 and 89 but don't feel it at all with 92. I'm sure that the ECM is pulling timing when that happens so I'll probably stay with 92.

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