EcoPowerParts

It's a high compression twin turbo motor, put the highest octane you can get in it, all the time. If you want to run cheap gas get an NA V6.

EcoPowerParts

Why would you buy a twin turbo DI motor with high compression to run low octane fuel?
Turbos add heat, heat creates detonation. You should always have a safety margin for the detonation with higher octane.
How do you know you're not getting knock counts? What are you verifying with? Ear or data logging.

natural gasser

The ECM/U whatever they call them now will take timing out when needed thus no knock with 87. It's what the motor was designed for and published test results reflect. Run whatever makes you/your wallet feel good.

jwanck11

87 Summer, 89-91 Winter... mostly 91 winter.

NASSTY

I run 91 octane with a 91 tune. I run 93 octane with a 93 tune when I get to the track, but 93 isn't available around here anymore so I run 91 for my regular everyday tune.

phantomblackgto

I have always ran 87, even pulling a 9,000 lb trailer in the Texas summer heat without any noticeable knock. The stock tune is extremely conservative and 87 is what it says in the manual. If I ever get a tune, it might be different, but for now , 87 is all I use.

greyboosted

87 for the last 118k miles

SkiSmuggs

My manual recommends premium for towing and for summer heat.

kevin7898

i wish i could afford premium, but at 16 cents per litre more expensive than regular, i run exclusively regular

Barry_Vee

2011-48K mostly on 87 octane. Premium doesn't seem to make any power, mpg, or other operational differences that I can tell. Where regular is 86 fill-ups are with a mid-grade. About the only time the truck gets filled with premium is for steep towing in hot weather only. Top tier fuels.