How Government Is Manipulating Fuel Formulas And How It Can Affect You

Valerie Raskovic

Created Date: May 06, 2026 | Modified Date: May 06, 2026

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While most of us are aware that gasoline is not the only compound that makes up automotive-grade fuel in recent years the formula has been changing. The government opened broader availability of an alcohol-based fuel additive called “ethanol”. Regulators are now allowing up to 15% ethanol blend (E15). While traditional goals of adding ethanol to fuel centered around environmental goals like reducing emissions, the most recent change is tied to the recent political climate and events causing fuel prices to spike and can have real-world implications for drivers, especially depending on the age and design of their vehicles.

What Is E15 Fuel?

First, it is important to understand what E15 is. This is a gasoline blend containing 15% ethanol and 85% gasoline. While adding ethanol to gasoline is nothing new, as most standard fuels in the US are categorized as E10 and contain upward of 10% ethanol.

Ethanol is derived from corn and it is a completely renewable source of energy. It burns much cleaner than pure gasoline; however, it is not as energy dense and behaves differently inside an engine.

Switching from 10% to 15% ethenyl can affect various car systems.

Fuel Economy

Ethanol contains less energy per gallon than gasoline and engines will often require more fuel to produce the same power.

One of the most noticeable effects of higher ethanol content is reduced fuel efficiency. In other words, you will need more fuel to cover the same distance, really dragging down your miles per gallon (MPG). This will also result in more frequent trips to the gas station.

Compatibility Issues

Not all vehicles are designed to run on an ethenyl blend higher than 10%. While many cars and light trucks model year 2001 and newer are approved for E15, using this new blend can cause serious problems to older vehicles and smaller engines often found in lawn equipment, motorcycles, boats and other recreational equipment.

Potential Wear on Fuel System Components

While most modern vehicles are designed to handle some ethanol, increasing the concentration can accelerate wear. Even if your vehicle was made after the year 2001, by introducing a higher ethanol content fuel, you may see some issues in premature failure related to various systems. Ethanol is more corrosive and it absorbs moisture, intruding water and accelerating corrosion on various internal systems such as the fuel injectors, fuel pumps, and other systems where the fuel may come in contact with rubber seals and metal. Over time, this can increase wear not only on the fuel systems but also create moisture buildup leading to corrosion in the engine itself.

Fuel Contamination and Moisture Concerns

Ethanol-blended fuels are more prone to absorbing water, which over time can lead to fuel contamination, decreased engine performance and premature failures. The problem is that ethanol-rich fuels have a shorter shelf life, meaning if you plan to leave the vehicle sitting for a long period of time, you may encounter some issues next time you go to crank the engine over. Similarly, if you have E15 sitting in the gas tank or even in fuel containers, it is safe to assume that it will no longer be usable after a 3-month period vs. regular gasoline, which has a shelf life of anywhere between 6 to 12months.

Noticeable Engine Performance Differences

Some cars may be built to provide peak performance on high ethanol blends like E85. In fact, that formula is quite common in race cars and performance application; however, for most vehicles not designed for this level of ethanol content, performance will often suffer.

It is quite common to experience a slight reduction in power output as well as changes in throttle response. In some cases, rough idle hesitation can be attributed to higher ethanol fuels. While these effects may be minor in newer vehicles, they can be more pronounced in older or sensitive engines.

Environmental Benefits

While ethenyl-rich fuels may have some serious costs, they also have some benefits. It is cleaner burning, leading to less harmful emissions, especially in vehicles designed to run on rich ethanol blends. Using this renewable fuel is also a way to reduce our reliance on fossil fuels, especially ones exported from overseas.

What you should do now

As E15 becomes more common, it is vital to check your owner’s manual or contact the manufacturer to see if your vehicle is designed to run on E15. Always buy fuel from reputable stations and avoid E15 in vehicles not designed for it. In some cases, using fuel-stabilizing additives may help prolong the shelf life and harmful effects of E15; however, they are unlikely to eliminate them entirely.

Understanding how higher ethanol blends affect your specific vehicle can help you avoid unnecessary wear, maintain performance, and make informed fueling decisions.