5 Best Gas Additives to Boost Your Car's Performance and Fuel Efficiency

When it comes to giving your car's performance a much-needed boost, think of gas additives as a secret weapon in your automotive arsenal. These five top-notch additives have the potential to revitalize your vehicle's efficiency and power output.

But before you rush to the nearest store, consider this – what makes these additives stand out from the rest? Stay tuned to uncover the key factors that could make a significant difference in your car's overall performance and fuel economy.

Rislone Hy-per Fuel Complete Fuel System Cleaner Gas

For car owners seeking a comprehensive solution to enhance engine performance and fuel efficiency, the Rislone Hy-per Fuel Complete Fuel System Cleaner Gas stands out as a versatile and effective choice. This six-in-one formula acts as an injector cleaner, upper cylinder lubricant, fuel stabilizer, conditioner, dry gas treatment, and octane booster all in a single product. By boosting power, performance, and mileage while stabilizing gas and lubricating and protecting the engine, this cleaner helps improve fuel economy and eliminate engine issues. EPA registered and safe for vehicles with oxygen sensors and catalytic converters, the Rislone Hy-per Fuel Complete Fuel System Cleaner Gas has garnered positive reviews for its ability to enhance overall performance and satisfaction. Ensure to follow usage tips for optimal results and consider caution for specific vehicle models.

Best For: Car owners looking for a multifunctional fuel system cleaner that enhances performance and fuel efficiency.


  • Six-in-one formula for comprehensive cleaning and enhancement.
  • Boosts power, performance, and mileage while stabilizing gas.
  • EPA registered and safe for vehicles with oxygen sensors and catalytic converters.


  • Some users noted temporary fixes and cost-effectiveness.

STP Gas Treatment, Fuel Intake System Cleaner (Pack of 12)

To maximize your vehicle's performance and fuel efficiency, consider using the STP Gas Treatment and Fuel Intake System Cleaner from the pack of 12 bottles. This 5.25 fl oz bottle of STP Gas Treatment improves gasoline quality, maintains fuel efficiency, and prevents harmful carbon, gum, and varnish deposits. It also helps prevent fuel line freezes and is formulated with jet fuel as a carrier of active ingredients. Customers have reported improved engine performance, smoother pick-up, and increased gas mileage by 35-45 miles per tank. Users recommend using this regularly during tank refills, especially for vehicles with added alcohol in the fuel. Trusted for its quality and effectiveness, this STP product is a valuable addition to your car care routine.

Best For: Those looking to improve their vehicle's performance and fuel efficiency while preventing harmful deposits in the fuel system.


  • Improves gasoline quality and maintains fuel efficiency
  • Prevents harmful carbon, gum, and varnish deposits
  • Helps prevent fuel line freezes


  • Some users may not see a significant increase in gas mileage

Hot Shots Secret Gasoline Extreme Fuel System Cleaner (12.00 Fl Oz)

When seeking to enhance the performance of your car's gasoline fuel system and engine, consider using Hot Shots Secret Gasoline Extreme Fuel System Cleaner (12.00 Fl Oz). This fuel additive from Hot Shots Secret cleans, lubricates, and protects your fuel system and engine, boosting fuel economy by up to 7.9% and restoring engine performance by dissolving deposits and varnish. Say goodbye to issues like poor fuel economy, rough idling, and loss of engine power.

Manufactured by Lubrication Specialties, Inc., this product has garnered positive customer feedback, with users reporting improved gas mileage and engine performance. Despite some packaging concerns, customers find this fuel system cleaner easy to use and beneficial for their vehicles.

Give your car the care it deserves with Hot Shots Secret Gasoline Extreme Fuel System Cleaner.

Best For: Those looking to improve fuel economy and restore engine performance in their gasoline-powered vehicles.


  • Boosts fuel economy by up to 7.9%.
  • Restores engine performance by dissolving deposits and varnish.
  • Easy to use and beneficial for vehicle maintenance.


  • Some packaging concerns reported by users.

Iso-HEET Water Remover and Premium Fuel Line Antifreeze (28202)

Ideal for drivers seeking enhanced fuel efficiency and engine protection, the Iso-HEET Water Remover and Premium Fuel Line Antifreeze (28202) stands out with its superior water removal capabilities and rust prevention features. This product, manufactured by Gold Eagle Co., is designed to absorb five times more water than regular gas dryers, making it highly effective in preventing rust and corrosion in all 2 and 4 cycle gas and diesel engines.

With an easy pour 12-ounce bottle that treats up to 20 gallons of fuel, the Iso-HEET (28202) is a convenient solution for maintaining your engine's performance. Customers have praised its ability to remove water from fuel tanks, especially in cold weather, leading to improved engine performance and fuel efficiency. To use, simply twist off the cap, puncture the seal, and pour the entire contents into the tank before or after fueling, ensuring optimal results with every fill-up in winter and every 5,000 miles in summer.

Best For: Drivers looking to improve fuel efficiency and protect their engine from rust and corrosion effectively.


  • Absorbs 5 times more water than regular gas dryers
  • Prevents rust and corrosion in engines
  • Suitable for both 2 and 4 cycle gas and diesel engines


  • Some compatibility issues reported with certain vehicles

STP Multi-Purpose Motor Treatment and Fuel Stabilizer (16 Oz)

Enhance your engine's performance and protect it from rust and oxidation with the STP Multi-Purpose Motor Treatment and Fuel Stabilizer. This 16-ounce solution is designed to stabilize fuel, fight rust buildup, prevent oxidative degradation, and combat tough cold starts. It works effectively with engines in storage by removing water to prevent fuel line freeze and with engines in use by cleaning engine deposits, fuel injectors, and intake valves. STP's formula also protects against viscosity buildup, crankcase sludge, and provides upper cylinder lubrication.

Customers have reported positive results, noting improvements in engine smoothness, idle, and even a slight increase in miles per gallon. Make the switch to STP for a reliable, cost-effective solution that rivals leading brands.

Best For: Those looking for a budget-friendly alternative to Sea Foam that effectively cleans engine deposits, improves engine performance, and prevents rust buildup.


  • Cost-effective option compared to leading brands like Sea Foam
  • Effectively cleans fuel injectors and intake valves
  • Helps enhance engine smoothness and idle performance


  • Some users may prefer the brand recognition of Sea Foam

Factors to Consider When Choosing Gas Additives

When choosing gas additives, consider key features, fuel efficiency benefits, engine performance enhancement, compatibility with your vehicle, and application instructions.

These factors can help you make an informed decision on which additive will best suit your car's needs for improved performance.

Ensure you select an additive that aligns with your specific requirements to maximize the benefits for your vehicle.

Key Additive Features

Consider key additive features when selecting gas additives to maximize the benefits for your vehicle's fuel system. Opt for additives with multi-functional properties such as injector cleaning, lubrication, fuel stabilization, and octane boosting to ensure comprehensive care for your engine.

Look for formulas that combat carbon, gum, and varnish deposits in the fuel intake system to uphold engine efficiency and performance. Prioritize additives that can eliminate water from the fuel system to prevent rust, corrosion, and fuel line freezes, particularly in colder climates.

Select products compatible with various engine types, including gas, diesel, two-stroke, and four-stroke engines, for versatile application. Evaluate additives that provide protection against engine deposits, friction, viscosity buildup, and crankcase sludge to enhance engine health and performance.

Fuel Efficiency Benefits

To maximize fuel efficiency with gas additives, prioritize selecting products that effectively remove deposits and contaminants from your vehicle's fuel system. By choosing additives that clean fuel injectors and optimize combustion, you can boost overall fuel economy.

These additives help prevent fuel line freezes and protect against corrosion in the fuel system, ensuring smooth engine operation and better mileage. Regular use of gas additives not only maintains optimal fuel efficiency but also prolongs the life of your engine.

When considering gas additives, look for those that offer these fuel efficiency benefits to get the most out of your vehicle's performance and economy.

Engine Performance Enhancement

To optimize your vehicle's engine performance, focus on selecting gas additives that effectively clean fuel injectors and intake valves, leading to improved combustion efficiency. By choosing additives that remove deposits and varnish from the fuel system, you can ensure optimal fuel flow and combustion, resulting in smoother acceleration, reduced engine knocking, and increased power output.

These enhancements not only improve your driving experience but also contribute to better fuel economy and lower emissions. Additionally, gas additives offering upper cylinder lubrication can reduce friction and wear on engine components, ultimately extending the longevity and overall performance of your engine.

When considering gas additives, prioritize those that target fuel system cleanliness and combustion efficiency for the best engine performance enhancements.

Compatibility Considerations

When selecting gas additives for your vehicle, prioritize compatibility considerations to ensure optimal performance and safeguard critical engine components. Check the gas additive's compatibility with your vehicle's make, model, and engine type to prevent any potential issues.

If you have a mixed fleet of vehicles, consider whether the gas additive is suitable for use in both gasoline and diesel engines. Look for additives that won't harm vehicles with oxygen sensors and catalytic converters.

Ensure the gas additive is designed for the specific fuel types you use, like ethanol-blended fuels, to avoid problems with fuel system components. Lastly, steer clear of additives containing alcohol or corrosive ingredients that could harm your fuel system or engine components in the long run.

Application Instructions

Consider following the manufacturer's recommended application instructions for gas additives to achieve optimal results and maintain your vehicle's performance.

Check whether the additive should be poured into a full tank or an almost empty one for the best outcome.

Some additives might need shaking before mixing with fuel to ensure effectiveness.

Understand how frequently the additive should be used to uphold fuel system cleanliness and efficiency.

Be mindful of any specific cautions or precautions provided for certain vehicles or engines when using the gas additive.

Frequently Asked Questions

Can Gas Additives Be Used in All Types of Vehicles, Including Diesel Engines?

Yes, gas additives can enhance performance and fuel efficiency in various vehicles, including diesel engines. However, it's crucial to choose additives specifically designed for diesel engines to ensure optimal results without causing any harm.

Are Gas Additives Safe to Use in Vehicles With High Mileage or Older Engines?

Yes, gas additives are safe for vehicles with high mileage or older engines. They can help clean fuel injectors, improve fuel efficiency, and restore engine performance. Always follow manufacturer recommendations and choose additives designed for your vehicle type.

How Often Should Gas Additives Be Used in a Vehicle for Optimal Performance?

For optimal performance, use gas additives every 3,000 to 5,000 miles. Follow the product instructions closely. Consistent maintenance helps keep your engine running smoothly and efficiently. Remember, a well-maintained vehicle is a happy vehicle.

Can Gas Additives Help Improve the Performance of Turbocharged or Supercharged Engines?

Yes, gas additives can definitely improve the performance of turbocharged or supercharged engines. They help clean fuel systems, reduce engine knock, and improve fuel combustion, leading to better overall engine performance and efficiency.

Are There Any Potential Side Effects or Risks Associated With Using Gas Additives in a Vehicle?

Using gas additives in your vehicle may lead to potential side effects. These include engine damage, reduced fuel efficiency, and emissions issues. It's essential to research and choose additives carefully to avoid any risks.


In conclusion, these top gas additives can help improve your car's performance and fuel efficiency. Whether you choose Rislone, STP, Hot Shots Secret, Iso-HEET, or STP multi-purpose treatment, you can trust that these products will help keep your fuel system clean and running smoothly.

Consider factors such as cost, brand reputation, and specific needs of your vehicle when selecting the best gas additive for your car. Boost your car's performance with these top gas additives today!