Unleaded Gas type -2021 GMC Yukon Xl

Reddog1473 · Mar 15, 2022

Hi
Wanted to see what Unleaded type people are using. I have a 2021 GMC Yukon XL.

R32driver · Mar 15, 2022

regular unleaded 87 octane in our '21 yukon xl with a 5.3 and IMO anything else is just burning extra money on higher octane for no added benefit

PaulGA · Mar 15, 2022

The 6.2 says "Premium Only" and that's what I've been using. Granted, I only have 550 miles on mine so far, so its not even 2 full tanks worth yet.

Quark · Mar 15, 2022

My 5.3 likes select brands and when it gets those brands it runs just fine on 87 octane. Which brands you might ask: CountryMark, Exxon Mobil, BP, Marathon will do in a pinch. Nothing worse than buying some crap Kroger gas and hitting the steep grades while it pukes all over the highway.

Dustindu4 · Mar 15, 2022

I only put 87 in my 6.2 L Denali and the engine doesn't knock. Ever.

You have to be dumb to put premium gas in it. Prove it to me otherwise

WalleyeMikeIII · Mar 15, 2022

Dustindu4 said:
I only put 87 in my 6.2 L Denali and the engine doesn't knock. Ever.

You have to be dumb to put premium gas in it. Prove it to me otherwise

Baja_Bob · Mar 16, 2022

I also have a 21 Yukon XL 5.3 and get along fine with the 87 octane, but in my Bronco sport I've tried all 3 grades and mid-grade gets the best MPG, better than 87 and no difference than using 91.

mb1500 · Mar 16, 2022

Dustindu4 said:
I only put 87 in my 6.2 L Denali and the engine doesn't knock. Ever.

You have to be dumb to put premium gas in it. Prove it to me otherwise

Yeah you would have to be stupid to run premium with 11.5:1 CR.

Geotrash · Mar 18, 2022

Dustindu4 said:
I only put 87 in my 6.2 L Denali and the engine doesn't knock. Ever.

You have to be dumb to put premium gas in it. Prove it to me otherwise

Hey, you do you, boo. Not our job to educate you.

I've done the research, and my 6.2's only get premium.

MrBishop · Mar 21, 2022

Dustindu4 said:
I only put 87 in my 6.2 L Denali and the engine doesn't knock. Ever.

You have to be dumb to put premium gas in it. Prove it to me otherwise

Your knock sensors work.

Unleaded Gas type -2021 GMC Yukon Xl

Reddog1473

TYF Newbie

R32driver

Full Access Member

PaulGA

Full Access Member

Quark

Full Access Member

Dustindu4

Full Access Member

WalleyeMikeIII

Full Access Member

Baja_Bob

Full Access Member

mb1500

Full Access Member

Geotrash

Dave

MrBishop

TYF Newbie

Similar threads

Forum statistics

Latest posts