Anyone run 87 octane in their 6.2?

[Shadow17]

Where do you guys get 91 octane? It's 87/89/92 or 93 over here.

 

[JennaBear]

92/93 is what you should run. We have 91 in CA.

Sent from my fone.

 

[nharkey85]

After developing the habit of using 91+ in my old VW 1.8 turbo, i catch myself using 91+ in my 4.8 tahoe

Sent from my SAMSUNG-SM-G920A using Tapatalk

 

[thebishman]

Have used 87 in my Tahoe for 4 years. No issues at all. Wonder how many miles of such egregious abuse this thing will take before my extended warranty has to buy me a new engine?


Sent from my iPhone using Tapatalk

Fairly sure the 5.3 engine only calls for 87 octane. It's the 6.2 in the Denali and Caddy versions that call for Premium iirc.

Bish

 

[JennaBear]

5.3 should run 89 due to the compression

 

[JennaBear]

Which is 11:1

 

[Kpwweb]

One thing to remember is that octane is also dependent on elevation... The higher in elevation the lower octane is needed (not as much O2). So Denver has 85, MO has 87 minimum...

Also, the lower the octane (RN), the more energy is contained in the fuel per unit... Octane measures knock. So more knock inhibitors = higher octane = less energy per unit...

That said, I run 91!

 

[JennaBear]

One thing to remember is that octane is also dependent on elevation... The higher in elevation the lower octane is needed (not as much O2). So Denver has 85, MO has 87 minimum...

Also, the lower the octane (RN), the more energy is contained in the fuel per unit... Octane measures knock. So more knock inhibitors = higher octane = less energy per unit...

That said, I run 91!

That was true in the 80s, but ever since electronic ignition control systems, the vast majority will automatically increase timing as air density decreases. Thus the same octane will be required at low elevation as high elevation.

 

[Kpwweb]

That was true in the 80s, but ever since electronic ignition control systems, the vast majority will automatically increase timing as air density decreases. Thus the same octane will be required at low elevation as high elevation.

True, but at reduced (sometimes greatly) performance levels.