Premium fuel 91 octane gains 20 hp / 14 lb-ft torque (vs. 87 octane) on gas engine 2.4L i-Force -- dyno test

[Cajun]

Would like to see E85 results

 

[Voodoo Rufus]

I could believe 20HP if the ECU adds a little boost or timing depending on knock detection. If true, it's a nice HP increase. I'm more likely to spend on 91oct because the engine is turbocharged anyway.

I saw another video from Stillen I think on them testing an air intake on the Tacoma iForce engine and getting 20-25HP out of it. I have a harder time believing that Toyota left that much performance on the table just for keeping out dirt and water.

 

[Dead Horse]

Would like to see E85 results

If Toyota would unlock their ECM so tuners could get a handle on it, going cornfed on a forced induction engine is definitely The Way.

 

[ItsmeAlex]

Now that we have lots of actual owners, does anyone run 93 octane and noticed a clear power gain using your butt dyno?

 

[Gastan]

This was just posted by STILLEN. Impressive power gains (+20 hp / 14 lb-ft torque) just using premium gas (91 octane) vs. regular gas (87 octane).

BTW Toyota's official specs recommends regular fuel for the 2025 4Runner, so it's absolutely fine running 87 octane.

87 vs. 91 Octane Fuel: STILLEN’s Kyle Millen reveals how fuel octane impacts the Tacoma’s 2.4L turbo engine, showing a 20-horsepower gain with premium fuel. Learn about octane ratings, real-world dyno results, fuel costs, warranty considerations, and why 91 or 93 octane is essential for maximum power, efficiency, and engine longevity—especially with TruControl or other performance upgrades. Don’t miss this must-watch guide for Tacoma owners!​

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Key Topics Covered:​

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What is octane, and why does it matter?​

Impact of fuel quality on turbocharged engines.​

Dyno-tested results: 87 vs. 91 octane on the Tacoma.​

Why cheap gas could cost you more in the long run.​

STILLEN's official fuel recommendations.​

Someone needs to do this test on the hybrid iForce MAX engine as well.