10 Best Gas Treatments 2025 in the United States

The STA-BIL Storage Fuel Stabilizer is designed primarily to keep gasoline fresh for up to 24 months, which is excellent for anyone who stores fuel for seasonal equipment or vehicles. It protects against corrosion and prevents build-up of gum and varnish in the fuel system, which can save you costly repairs. This stabilizer works well with all gasoline types, including ethanol blends from E-10 to E-85, and is suitable for both 2-cycle and 4-cycle engines. This versatility makes it a good choice for a variety of equipment like lawnmowers, motorcycles, boats, and generators.

One convenient feature is its concentration and dosage: a 32 oz. bottle treats up to 80 gallons of fuel, with clear instructions provided on the bottle for measuring smaller or larger amounts. It’s recommended to add it to fresh fuel and keep the tank mostly full to avoid condensation. After adding, running the engine for a few minutes helps treat the entire system. The brand, STA-BIL, has a solid reputation and ranks highly in fuel additives, which adds confidence in its reliability. It is made in the USA by a family-owned company, which some users appreciate for quality assurance.

This product is excellent for storage stabilization but is not formulated for cleaning or improving fuel performance during regular use. It requires proper application and storage awareness to be most effective. If you do not store fuel for long periods, or if you need a treatment that boosts engine performance, you might want to consider other options. STA-BIL Storage Fuel Stabilizer serves as a dependable fuel additive for safely storing gasoline over long periods, protecting engines from common storage-related issues.

The Chevron Techron High Mileage Fuel System Cleaner is a fuel additive designed to restore power and performance in older vehicles by removing deposits like gum and varnish from the fuel system. It excels in its type as a high mileage cleaner, making it especially useful for vehicles with significant usage. The product is compatible with various ethanol-blended fuels, including E10 and E85, which enhances its versatility.

Users are advised to use it periodically for optimal results, though the exact frequency isn't specified in the brief, which can be a minor drawback for first-time users. The concentration and dosage seem effective, as indicated by numerous positive customer reviews and its high ranking among fuel system cleaners. The pack of six 12-ounce bottles offers good value for those who plan regular maintenance. Chevron, as a brand, is reputable with strong customer feedback, boasting a 4.6-star rating from 874 reviews.

It also provides protection against corrosion for multiple metal components within the fuel system, which is a significant benefit for long-term vehicle upkeep. On the downside, the product dimensions and weight may not be as important, but they confirm its bulkier nature, which might be less convenient for storage. If you have a high-mileage vehicle needing a thorough fuel system cleaning and protection, this Chevron product stands as a reliable choice.

The Gumout 510011 Multi-System Tune-Up is a versatile gas treatment designed to clean and protect various parts of your engine, including GDI injectors and carburetors. It works well with different fuel types—gasoline, diesel, and ethanol blends—which makes it a flexible choice if you use multiple engines or equipment. The treatment cleans deposits, stabilizes fuel to prevent corrosion from ethanol and moisture, and improves engine performance and fuel economy. It is easy to use, as it can be added directly to the gas tank or other engine parts, which is convenient for regular maintenance.

The product comes in a 16-ounce bottle, and since it is sold in packs of six, it suits users who prefer to treat their engines frequently or cover multiple vehicles or machines. Highly rated by thousands of users, it has a solid reputation for effectiveness and reliability. The product weight and packaging size might be more than necessary for those who only need occasional treatment or have a single small engine. Additionally, while it claims compatibility with various engines, some specialized engines might require treatments formulated specifically for their fuel systems. This product is a strong option for anyone looking to maintain engine cleanliness and performance across a range of fuel types, especially if regular use and engine care are priorities.