87 or 89 Octane

[O2_Stat]

wondering what most people use here just for general driving. I have a 2017 Tahoe. And does it make a difference when using a higher octane? Thanks for the input

 

[RThomasII]

Read through the BB Tune '17 5.3 thread. Based on the information provided in that thread from someone who is a reliable source, the 5.3 should be running at least 89 octane primarily due to the fact that the 5.3 engine compression is 11.0:1.

For the record, I've been running a better brand of 87 (Shell, Exxon, Mobil) gas since I purchased my truck new. On the next fill up I plan to jump up to 89 to see if it makes a difference.

 

[Kenny D]

I do not know if Shell has changed their formula, but I would not use Shell gas. Tons of google hits on Shell making GM fuel sending units go out in the early 2000's.

 

[JennaBear]

Read through the BB Tune '17 5.3 thread. Based on the information provided in that thread from someone who is a reliable source, the 5.3 should be running at least 89 octane primarily due to the fact that the 5.3 engine compression is 11.0:1.

For the record, I've been running a better brand of 87 (Shell, Exxon, Mobil) gas since I purchased my truck new. On the next fill up I plan to jump up to 89 to see if it makes a difference.

This is correct, 89 is recommended for the compression, even on a stock tune.

 

[Illnasty]

I foolishly use 92 in my stock Denali. Not basing this on anything besides the fact I fill her up one every six weeks so don't mind spending the money.

 

[JennaBear]

Not foolish at all.

 

[yates ™]

I use 87 all the time in my truck I did try 89 for awhile but really didn't see any difference at the pump but who knows internally.