Premium Fuel or Regular

[px3_taco]

Different ecu calibrations and power/torque outputs can lead to more knock with lower octane gas so they recommend a higher octane that meets their needs.

It’s the same engine. In every way. I run premium in both.

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[goin2drt]

Same engine DOES NOT equal you have to run the same octane.

 

[JayTech]

It’s the same engine. In every way. I run premium in both.

Same engine but the calibration isn't necessarily the same. They can have identical torque and hp numbers and still have a different calibration. There are a lot of variables.

 

[SpartanCaptain]

Dyno tests on youtube show a 20hp gain going from 87 to 91.

 

[HarryDaHamster]

After watching this video, I use premium. No cheaper way to add horsepower

 

[JakeJoeBob]

So here is the deal, 91 octane bumps the power of the engine by about 20hp and 14lb-ft of torque and maybe a bit more in some cases (ive seen a few different dyno charts some being higher than those number but no lower). Truck runs smoother, mpg is better. Turbos like higher octane. 87 is fine if you don't care about that though.

 

[MT-Taco]

Premium, ethanol free. Feels as strong as my 5.7 tuned Tundra did, minus the gear hunting.

 

[bigd9247]

Premium

 

[crepr12]

Your mula..when I get my limited it will be what the manual suggest...Except I'll change my oil every 5k or six months...my mula

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