10 Best Fuel Gas Additive of 2025

Tested and Reviewed: Top 10 Fuel Gas Additive deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

Save 15%

Hot Shot's Secret

‎Hot Shot's Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Injector Cleaner - Increases MPG & Restores Engine Performance

15% OffFree Shipping

Editor's bottom line:

“This fuel gas additive is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

CLEANS FUEL STYSTEM: Hot Shots Secret Gasoline Extreme is designed to thoroughly clean, lubricate, and safeguard all components of a gasoline engine & fuel system, such as valves, pumps, injectors, rings, pistons, and upper cylinders.
BOOSTS FUEL ECONOMY: By thoroughly cleaning the fuel system, this fuel additive boosts MPG up to 7.9%, ensures combustion efficiency, & engine power, resulting in a smoother & more efficient driving experience.
FIXES ISSUES: This fuel treatment addresses common issues associated with rough-running engines in a single treatment. Designed to improve fuel economy, smooth out idling, & unclog fuel injectors, this will have your engine running great again!
RESTORES PERFORMANCE: High-performance cleaner that utilizes P.E.A. technology to deeply clean & restore engine power, dissolve gum & varnish buildup, removes deposits from the combustion chamber, resulting in improved overall engine performance.
EASY TO USE: With a simple application of 12 oz. for every 20 gallons of gasoline, this product is easy to use! Just pour it into your fuel tank during your next fill up or every 10,000 miles
POWERED BY SCIENCE: Our products are engineered to resolve issues, make equipment last longer and improve efficiency. Nothing leaves our building with our name on it unless we know it is absolutely the BEST it can be.

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Picked by 345 people today

Best Value

9.5

Save 40%

Heet

HEET Water Remover & Premium Gas Line Antifreeze, Removes Water from Fuel System, Prevents Gas-line Freezing, Winter Fuel Additive for Fast Cold Weather Starts, 12 fl. oz.

40% OffFree Shipping

Main Highlights

HIGHLY EFFICIENT FILTERING & WATER SEPARATION: Keep your fuel line clean and free of water with the best selling brand of gas-line antifreeze and water remover
PREVENTS RUST & CORROSION: By absorbing excess moisture, HEET helps keep the fuel system dry, reducing the risk of rust & corrosion. This ensures smoother engine operation, longer-lasting performance, & protection.
SAFE FOR: All 4-cycle engines including fuel injected engines.
HEET QUALITY: The health of your cars & outdoor equipment depends on the quality of your gas-line anti-freeze. With HEET products pumping through your engines veins, youll always be safeguarded against freeze-ups in winter.

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9.5

Heet

Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner Helps Increase Gas Mileage Improves Engine Performance Year Round Performance, 12 fl. oz. (28202) , Red

Free Shipping

Main Highlights

Selling brand of premium gas-line antifreeze
Absorbs 5 times more water than regular gas dryers
Removes water from fuel system
Prevents rust and corrosion
This item is not for sale in Catalina Island
No.1 selling brand of premium gas-line antifreeze
Absorbs 5 times more water than regular gas dryers
Removes water from fuel system
Prevents rust and corrosion
This item is not for sale in Catalina Island

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9.2

Save 37%

STA-BIL

STA-BIL Storage Fuel Stabilizer, Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Fuel Additive that Protects Fuel System, Gas Stabilizer for Fuel Storage, 8 oz.

37% OffFree Shipping

Main Highlights

Keeps fuel fresh for up to 24 months during storage
Eliminates need to drain fuel prior to storage
Ensures quick, easy starts after storage
Effective in all gasoline, including ethanol blends

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9.0

Save 16%

STAR BRITE

STAR BRITE Star Tron Enzyme Fuel Treatment, Small Engine Formula, 8 Fl Oz – Treats up to 48 Gals – Gas Additive Rejuvenates & Stabilizes Old Gasoline, Cures & Prevents Ethanol Problems (14308) , Blue

16% OffFree Shipping

Main Highlights

UNLEASH YOUR ENGINE'S FULL POTENTIAL - Star Tron Enzyme Fuel Treatment uses advanced enzyme technology to ensure all engines start easily and run smoothly, even after months of inactivity
SAY GOODBYE TO ETHANOL-RELATED PROBLEMS - Prevents and cures most ethanol-related issues, including poor performance, rough idling, & decreased fuel economy, giving you peace of mind
MAXIMIZE FUEL ECONOMY - By removing and preventing gum, carbon deposits, and varnish build-up, Star Tron keeps your fuel delivery system clean, resulting in improved fuel economy
WORKS FOR ALL ENGINES AND FUEL TYPES - Whether you have a car, boat, RV, or lawn mower, Star Tron works in all engines and all fuels, making it the ideal fuel treatment and stabilizer for any vehicle
WORKS FOR ALL ENGINES AND FUEL TYPES - Whether you have a car, boat, RV, or lawn mower, Star Tron works in all engines and all fuels, making it the ideal fuel treatment and stabilizer for any vehicle
REDUCE EMISSIONS & SAVE MONEY - Star Tron reduces smoke and emissions which are a symptom of poor combustion which wastes gas and is harmful to our health & planet
REVITALIZE OLD FUEL - Star Tron stabilizes fuel up to 2 years and can even help rejuvenate old, sub-spec fuel
PROUDLY MADE IN THE USA - Since 1973, Star brite products have been crafted with pride in the United States, ensuring quality and reliability

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8.8

Rislone

Rislone Hy-per Fuel Complete Fuel System Cleaner Gas

Free Shipping

Main Highlights

SIX IN ONE: Equal to a bottle of regular injector & complete fuel system cleaner, upper cylinder lubricant, fuel stabilizer and conditioner, dry gas, gas treatment and octane booster
INCREASE POWER AND PERFORMANCE: Boosts Octane, Power, Performance and Mileage, Stabilizes Gas, Lubricates and Protects
SAVE GAS: Cleans and lubricates the complete fuel system; Engine dynamometer tests show improved fuel economy
RUN SMOOTHER: Helps eliminate noisy injectors and fuel pumps, rough idle, hard starting and hesitation; Regular use provides reduced fuel system and emission control repairs
EPA REGISTERED: Will not void manufacturers new vehicle warranty and safe to use on vehicles with oxygen sensors and catalytic converters; Exceeds EPA compliance performance criteria and is EPA registered

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8.6

Save 13%

VP Racing

VP Racing 2848 Madditive 7-in-1 Fuel Treatment, 16 Ounce Bottle - Gas Additive for Cars, Trucks, SUVs, Motorcycles & Any 2-Cycle or 4-Cycle Gas Engine (1 Pack)

13% OffFree Shipping

Main Highlights

IMPROVES FUEL ECONOMY: Deposit-free engines consume less fuel, resulting in more miles per gallon.
STABILIZES FUEL: Keeps fuel fresh, even during storage periods.
REDUCES EMISSIONS: Cleaner running engines emit less pollutants, making it easier to pass your next SMOG test.
REMOVES DEPOSITS: Cleans combustion chambers, intake valves, and fuel injectors for peak performance.
HELPS PREVENT WEAR: Maximizes engine life, even in high-mileage engines, for better long-term dependability.

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8.3

Save 5%

STAR BRITE

Star Tron Enzyme Fuel Treatment - Small Engine Formula - 16 Oz - Treats up to 96 Gals - Gas Additive Rejuvenates & Stabilizes Old Gasoline, Cures & Prevents Ethanol Problems, Improves MPG (014316)

5% OffFree Shipping

Main Highlights

UNLEASH YOUR ENGINE'S FULL POTENTIAL - Star Tron Enzyme Fuel Treatment uses advanced enzyme technology to ensure all engines start easily and run smoothly, even after months of inactivity
SAY GOODBYE TO ETHANOL-RELATED PROBLEMS - Prevents and cures most ethanol-related issues, including poor performance, rough idling, and decreased fuel economy, giving you peace of mind on the road or on the water
MAXIMIZE FUEL ECONOMY - By removing and preventing gum, carbon deposits, and varnish build-up, Star Tron keeps your fuel delivery system clean, resulting in improved fuel economy
WORKS FOR ALL ENGINES AND FUEL TYPES - Whether you have a car, boat, RV, or lawn mower, Star Tron works in all engines and all fuels, making it the ideal fuel treatment and stabilizer for any vehicle
PREVENT WATER BUILD-UP - Helps prevent phase separation by dispersing water throughout fuel as submicron-sized droplets that are safely eliminated while the engine operates, keeping your engine running smoothly in humid or wet conditions
REVITALIZE OLD FUEL - Star Tron stabilizes fuel up to 2 years and can even help rejuvenate old, sub-spec fuel
REDUCE EMISSIONS & SAVE MONEY - Star Tron reduces smoke and emissions which are a symptom of poor combustion which wastes gas and is harmful to our health & planet. Try Star Tron Enzyme Fuel Treatment today and experience the difference
GET MORE BANG FOR YOUR BUCK - At just one fluid ounce per six gallons of fuel, Star Tron Fuel Treatment is an incredibly cost-effective solution for optimizing engine performance and efficiency
MADE IN THE USA: Star brite products have been made with pride in the USA since 1973

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8.1

Save 19%

STP

STP Gas Treatment, Fuel Intake System Cleaner, Bottles, 5.25 Fl Oz, Pack of 12

19% OffFree Shipping

Main Highlights

One 5.25 fl oz bottle of STP Gas Treatment
Improves the quality of gasoline and helps maintain fuel efficiency
Prevents the build-up of harmful carbon, gum and varnish deposits
Helps prevent fuel line freezes
Fuel cleaner formulated with jet fuel, a high-quality carrier of active ingredients
Use this gas additive regularly when you fill up your tank
STPOne of the most trusted names in car care for more miles than anyone can count

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8.1

The Fuel Ox

FuelOx Complete Fuel Treatment and Combustion Catalyst Additive for Gas/Diesel

Free Shipping

Main Highlights

Designed to replace the lubricity agents stripped from todays low sulfur diesel fuels.
Fuel Ox is tested safe and effective in all petroleum fuels.
Fuel Ox contains a patented combustion catalyst that lowers the temperature for combustion and provides a more through and complete burn.
This in turn provides an increase in fuel economy, in power, and vehicle responsiveness.

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Our Best Overall Choice

Best Choice

9.7

Hot Shot's Secret

‎Hot Shot's Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Injector Cleaner - Increases MPG & Restores Engine Performance

15% OffFree Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

CLEANS FUEL STYSTEM: Hot Shots Secret Gasoline Extreme is designed to thoroughly clean, lubricate, and safeguard all components of a gasoline engine & fuel system, such as valves, pumps, injectors, rings, pistons, and upper cylinders.
BOOSTS FUEL ECONOMY: By thoroughly cleaning the fuel system, this fuel additive boosts MPG up to 7.9%, ensures combustion efficiency, & engine power, resulting in a smoother & more efficient driving experience.
FIXES ISSUES: This fuel treatment addresses common issues associated with rough-running engines in a single treatment. Designed to improve fuel economy, smooth out idling, & unclog fuel injectors, this will have your engine running great again!
RESTORES PERFORMANCE: High-performance cleaner that utilizes P.E.A. technology to deeply clean & restore engine power, dissolve gum & varnish buildup, removes deposits from the combustion chamber, resulting in improved overall engine performance.
EASY TO USE: With a simple application of 12 oz. for every 20 gallons of gasoline, this product is easy to use! Just pour it into your fuel tank during your next fill up or every 10,000 miles
POWERED BY SCIENCE: Our products are engineered to resolve issues, make equipment last longer and improve efficiency. Nothing leaves our building with our name on it unless we know it is absolutely the BEST it can be.

Show Price

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STAR BRITE Star Tron Enzyme Fuel Treatment - Concentrated Gas Formula - Treats 256 Gallons - 16 OZ (093016)

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10 Best Fuel Gas Additive of 2025

Tested and Reviewed: Top 10 Fuel Gas Additive deals with expert ratings from 8.1 to a perfect 10

Hot Shot's Secret

‎Hot Shot's Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Injector Cleaner - Increases MPG & Restores Engine Performance

Editor's bottom line:

Main Highlights

Heet

HEET Water Remover & Premium Gas Line Antifreeze, Removes Water from Fuel System, Prevents Gas-line Freezing, Winter Fuel Additive for Fast Cold Weather Starts, 12 fl. oz.

Main Highlights

Heet

Heet Iso-HEET Water Remover And Premium Fuel Line Antifreeze + Injector Cleaner Helps Increase Gas Mileage Improves Engine Performance Year Round Performance, 12 fl. oz. (28202) , Red

Main Highlights

STA-BIL

STA-BIL Storage Fuel Stabilizer, Keeps Fuel Fresh for 24 Months, Prevents Corrosion, Gasoline Treatment Fuel Additive that Protects Fuel System, Gas Stabilizer for Fuel Storage, 8 oz.

Main Highlights

STAR BRITE

STAR BRITE Star Tron Enzyme Fuel Treatment, Small Engine Formula, 8 Fl Oz – Treats up to 48 Gals – Gas Additive Rejuvenates & Stabilizes Old Gasoline, Cures & Prevents Ethanol Problems (14308) , Blue

Main Highlights

Rislone

Rislone Hy-per Fuel Complete Fuel System Cleaner Gas

Main Highlights

VP Racing

VP Racing 2848 Madditive 7-in-1 Fuel Treatment, 16 Ounce Bottle - Gas Additive for Cars, Trucks, SUVs, Motorcycles & Any 2-Cycle or 4-Cycle Gas Engine (1 Pack)

Main Highlights

STAR BRITE

Star Tron Enzyme Fuel Treatment - Small Engine Formula - 16 Oz - Treats up to 96 Gals - Gas Additive Rejuvenates & Stabilizes Old Gasoline, Cures & Prevents Ethanol Problems, Improves MPG (014316)

Main Highlights

STP

STP Gas Treatment, Fuel Intake System Cleaner, Bottles, 5.25 Fl Oz, Pack of 12

Main Highlights

The Fuel Ox

FuelOx Complete Fuel Treatment and Combustion Catalyst Additive for Gas/Diesel

Main Highlights

Our Best Overall Choice

Hot Shot's Secret

‎Hot Shot's Secret Gasoline Extreme 12 Oz, Concentrated Fuel System Cleaner, Fuel Additive for Gasoline Engines, Injector Cleaner - Increases MPG & Restores Engine Performance

Editor's bottom line:

Main Highlights

Related Deals You Might Like for Fuel Gas Additive

zMAX 58-011 - Engine & Fuel Formula Kit - Easy to Use - Reduces Carbon Build-Up & Lubricates Metal Extending Life of Car or Truck - Runs Efficiently, Improving Gas or Diesel Mileage - 12 oz - 2 Pack

RACE GAS Ultra ADDITIVE 32oz

STP Gas Treatment, Fuel Intake System Cleaner, Bottles, 5.25 Fl Oz, Pack of 12

RACE GAS RaceGas ADDITIVE, 16 Ounces

K-100 Additive, Gas Treat/Stabilizer Qt.

STAR BRITE Star Tron Enzyme Fuel Treatment - Concentrated Gas Formula - Treats 256 Gallons - 16 OZ (093016)

Manhattan Oil Scented Gas Additive 4 oz Rippin' Root Beer

Manhattan Oil Scented Gas Additive 4 oz Full Blown Bubble Gum

Manhattan Oil Scented Gas Additive 4 oz Rocket Cotton Candy

K-100 Gas Treatment W/Revitalizer Stabilizer/Octane Booster 8oz SKU:100 (K100-G)

Deals are Live