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What type gas do you use? 87? 89? 92?

goblue4016
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fondupot Senior Enthusiast

fondupot

Posted
Posted

I use 89 octane at the advice of Blackbear tuning. They recommend at minimum using 89 octane even on STOCK tuning (for the 5.3 and 4.3). 6.2 motors should be using a minimum of 91.

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PMattras
PMattras

I am using 87 as to what is noted in the truck manual. Why waste money if you don't need it.

haider320
haider320

89. These engines have to high of a compression ration to run the cheap stuff.

TxTruckMan
TxTruckMan

I ran several tanks over two months with 93 and saw absolutely no difference from 87. Now I stick with 87 and save ~$10 a tank.

BlackZ71Silverado Senior Enthusiast

BlackZ71Silverado

Posted
Posted

I use regular 87 for daily driving and I use premium 91 for towing my 6000lbs camper... sometimes the boat too at 3500lbs, but not always... depends on how full tank already was... but only premium 91 in the boat or else it pings.

Unless you are tuned for the higher octane or have the 6.2L engine, you are wasting your money filling up with 91 octane. Putting higher octane in your truck because you are towing something will not help with anything but making your wallet lighter.

 

 

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dbannerz71 Enthusiast

dbannerz71

Posted
Posted

I use 89 octane at the advice of Blackbear tuning. They recommend at minimum using 89 octane even on STOCK tuning (for the 5.3 and 4.3). 6.2 motors should be using a minimum of 91.

That must have been you that I heard that from. Why did he recommend 89? Was it due to what he was seeing via engine knock sensors? My thoughts are that perhaps it was with 87 he saw some knock retarding happening while 89 was just enough to avoid it and 92+ wasn't necessary?

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haider320 Enthusiast

haider320

Posted
Posted (edited)

89. These engines have to high of a compression ration to run the cheap stuff.

Edited by haider320
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TxTruckMan Senior Enthusiast

TxTruckMan

Posted
Posted

I ran several tanks over two months with 93 and saw absolutely no difference from 87. Now I stick with 87 and save ~$10 a tank.

  • Like 2
Fishingbear Enthusiast

Fishingbear

Posted
Posted

I use 87 exclusively and only fill up at Shell, BP, Chevron, or Mobil. My lifetime average fuel economy is 18.1 mpg for 8,000 miles. My typical highway economy is 21 mpg. I cannot run e85 because my 2015 engine is not compatible.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

E85 or mid grade gas. E85 locally mid grade on trips.

 

 

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high country Enthusiast

high country

Posted
Posted

The 5.3 can get by with 87 but I bet it will show better numbers with 89 over the long run, the 6.2 with approximately 11.5:1 compression needs the good stuff, 93 octane is all my truck sees.

Ridersfan Enthusiast

Ridersfan

Posted
Posted

Unless you are tuned for the higher octane or have the 6.2L engine, you are wasting your money filling up with 91 octane. Putting higher octane in your truck because you are towing something will not help with anything but making your wallet lighter.

 

 

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It won't get me any better fuel economy and certainly costs me more, all true... but has better additives and runs cooler. It's worth the extra $$$ to run cooler when towing to me.

Last C5 Enthusiast

Last C5

Posted
Posted (edited)

I have the 6.2 so I run 92 or 93 depending on where I gas up.

Edited by Last C5
Stars_Fan Enthusiast

Stars_Fan

Posted
Posted (edited)

E85 or mid grade gas. E85 locally mid grade on trips.

 

 

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This.

 

I average around 18-18.5 with e85 and 20.5-21 with 89. Financially it doesn't make any since to run regular gas as long as I can find e85.

Edited by Stars_Fan
bdsilverado Enthusiast

bdsilverado

Posted
Posted

E85 or mid grade gas. E85 locally mid grade on trips.

 

 

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Same thing here! Except I only use e85 when home and use gas when I go up north. I wonder if the motor will ever have long term effects with using roughly 95% of my fuel being e85. Thats what a warranty is for.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

This.

 

I average around 18-18.5 with e85 and 20.5-21 with 89. Financially it doesn't make any since to run regular gas as long as I can find e85.

I pay between 1.35-1.65 for E 85, even if was the same price as mid grade gas Id buy it for the extra HP. I only use gas when I can't get E85 traveling.

 

 

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high country Enthusiast

high country

Posted
Posted

It won't get me any better fuel economy and certainly costs me more, all true... but has better additives and runs cooler. It's worth the extra $$$ to run cooler when towing to me.

This has me confused, can you explain why it would run cooler?

nadrojcote Senior Enthusiast

nadrojcote

Posted
Posted

Ethanol burns cooler than gas, but your engine has to burn more e85 which makes it run hotter than burning gas.

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