What kinda fuel y'all run?

[bigT63]

Due to the high compression in the EcoTec3, I run 89+ octane. In Oklahoma, we are able to purchase 100% gasoline and that's what I run... I have never paid attention to E85. I looked up the specs on the EcoTec3 5.3 engine we have in our '16 Tahoe, and GM rates the engine at a higher HP/TQ on E85 fuel. I always heard E85 had lower BTU's and your ride suffered poor mileage when used... maybe true back in 07-08 when I first heard about E85. But in the 405 area code, E85 is 2.08/gal and 105 octane.

What's the octane of E85 in your hood? What mileage do you get between both fuels? If you alrernate between fuels of 89/105 octane, what can that do to the engine? I am mine nothing can be harmed since these engines are flex fuel... but just asking what y'all use... TIA.

 

[chicagofan00]

Use 87 octane 99% of the time. Will do the occasional 89 or 91 but haven't noticed a difference when I have.

 

[beachcomber]

I use 93 octane every time. I feel that it's better in the long haul. I'm sure I'll be corrected, but works for me.


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[cardude2000]

6.2L engine here. 93 in every tank.

 

[Miami-Dade]

Nothing but Mobil 87 regular..Got 24 MPG on my last trip from Miami-NYC which was last December.

Have no plans to ever run E85.

 

[2011SSVHOE]

Regular Sheetz gas 87 no e15 or e85 bad gas mileage from ethanol

 

[TheAutumnWind]

e85 uses more fuel yes but it cools the intake charge which is advantageous for forced induction.

http://www.superchevy.com/how-to/additional-tech/1110chp-e85-fuel-switch/

 

[TheAutumnWind]

I'm running 91 in the LQ9, which I understand is the preferred option. It ran without any real issues on 87, but I suspect the knock sensor works overtime and it runs a less aggressive timing map when running 87.

I'd love to hear peoples thoughts on this actually. I never thought twice about running anything other then 87 on my LQ4, but the higher compression of the LQ9 makes me think that the higher octane fuel may be worthwhile.

 

[iamdub]

I'm running 91 in the LQ9, which I understand is the preferred option. It ran without any real issues on 87, but I suspect the knock sensor works overtime and it runs a less aggressive timing map when running 87.

I'd love to hear peoples thoughts on this actually. I never thought twice about running anything other then 87 on my LQ4, but the higher compression of the LQ9 makes me think that the higher octane fuel may be worthwhile.

IICR, vehicles with the LQ9 (Silverado SS, Escalade, etc.) were recommended to run 91 or higher, but not required. I don't recall the exact verbage, but the manual stated something to the effect of "reduced performance" if octane lower than 91 was used. GM's of that era were known to have conservative timing tables. So, you could run 87, but don't run it hard or you may get pinging and even further retarded timing.

 

[TheAutumnWind]

IICR, vehicles with the LQ9 (Silverado SS, Escalade, etc.) were recommended to run 91 or higher, but not required. I don't recall the exact verbage, but the manual stated something to the effect of "reduced performance" if octane lower than 91 was used. GM's of that era were known to have conservative timing tables. So, you could run 87, but don't run it hard or you may get pinging and even further retarded timing.

That's what I have read as well. I did run a tank of 87 at some point and there were no issues, but it seems to like 91 @ WOT better.