June 16th, 2026

If you’ve spent any time around performance vehicles, you’ve probably heard the claims about E85: higher octane, cooler intake temperatures, and more horsepower.

For performance enthusiasts, those advantages are nothing new. The question is why E85 delivers them in the first place.

Here’s why. 

The octane advantage

Octane measures a fuel’s resistance to engine knock: when the air-fuel mixture inside an engine ignites too early or unevenly during combustion. Knock limits performance because it forces engines to run more conservatively.

In California, regular gasoline is typically 87 octane and premium gasoline is generally limited to 91 octane. E85 typically delivers an octane rating of 100 or higher.

That additional knock resistance gives performance engines more room for optimization. Tuners can run more aggressive ignition timing and unlock additional horsepower and torque that would not be possible on standard pump gasoline.

The benefits can vary depending on the engine and tuning strategy, but performance enthusiasts have long valued E85 for the flexibility it provides when optimizing engine performance.

Why turbocharged engines benefit from E85

Forced-induction engines compress incoming air to increase power output. More air means more potential power, but it also creates additional heat and increases the risk of knock.

E85 helps address both challenges.

Its higher octane rating provides greater resistance to knock under boost, while ethanol absorbs heat as it evaporates in the intake system. Together, these characteristics can allow turbocharged and supercharged engines to operate more effectively under demanding conditions.

That’s one reason E85 has earned a strong following within the performance community.

Understanding the fuel economy trade-off

One of the most common questions about E85 involves fuel economy.

Because ethanol contains less energy per gallon than gasoline, vehicles running E85 will typically experience lower miles per gallon compared to gasoline. The exact difference varies by vehicle, driving habits, and engine calibration.

E85 consistently costs significantly less at the pump, helping offset the difference while providing access to a 100+ octane fuel.

What this means for California drivers

California drivers face a unique challenge when it comes to high-octane fuel. Premium gasoline is generally limited to 91 octane, leading some performance enthusiasts to rely on expensive race fuels or additives when pursuing additional power.

E85 offers another option.

Today, E85 is available at more than 600 stations throughout California, making high-octane fuel more accessible than ever for drivers of compatible vehicles. Pearson Fuels supplies more than 500 of those stations.

At the same time, policymakers are considering ways to expand access further. AB 2046, the Access to Affordable Gas Act, would create a pathway for compatible, non-flex fuel vehicles to be legally converted for E85 use in California, potentially opening the door for more drivers to take advantage of ethanol’s performance and affordability benefits.

Science—not marketing—drives E85’s performance benefits.

E85’s high octane rating can support more aggressive tuning, while ethanol’s heat-absorbing properties can benefit high performance applications. Combined with broad availability and a pump price lower than gasoline, E85 offers a combination of performance and affordability that is difficult to find elsewhere.

As E85 availability continues to expand across California, more drivers are discovering the benefits of a fuel that delivers both performance potential and value at the pump.