Best Fuel Additive For Horsepower: 10 Formulas Compared

#1 · Best Overall

1. Lucas Oil Fuel Treatment

• Weight: 898 g

Best for: Gasoline-and-diesel maintenance.

Why it ranks #1: Its listed claims directly connect increased power and acceleration with improved fuel flow and reduced deposits, and it is formulated for gasoline and diesel.

Gasoline and diesel compatibility is the defining advantage of Lucas Oil Fuel Treatment, letting owners of either engine type use one treatment for fuel-system care. The listed functions include cleaning and lubricating injectors, carburetors, and combustion chambers, while improved fuel flow and reduced deposits are tied to power and acceleration.

This quart bottle contains 32 fluid ounces, a practical format for owners who want more than a single small treatment on hand. Lucas says the formula cleans and lubricates injectors, carburetors, and combustion chambers, while neutralizing sulfur and other harmful contaminants. Its stated use across gasoline and diesel fuels broadens its fit; the product also links improved fuel flow and reduced deposit buildup with power and acceleration, rather than claiming a specific horsepower gain.

Skip it if you only want an additive specifically labeled for gasoline engines; Hot Shot's Secret Gasoline Extreme is identified for gasoline use.

Choose this Lucas treatment if one bottle needs to serve gasoline or diesel equipment and you value its stated cleaning and lubrication functions. Its 32-ounce size suits ongoing ownership better than someone seeking a small, narrowly targeted treatment.

Listed on Amazon as: Lucas Oil 10003 Fuel Treatment – 1 Quart

#2 · Direct Power Claims

2. PROGREEN Ultra Sport

• Weight: 2.39 oz

Best for: Fuel freshness and throttle response.

Why it ranks #2: The 2.7-ounce product explicitly claims increased horsepower and torque, alongside quicker throttle response and reduced acceleration delay.

PROGREEN Ultra Sport combines claimed horsepower and torque increases with quick throttle response and reduced acceleration delay, directly addressing drivers focused on how a vehicle responds. Its 2.7-ounce shot also claims to bind dispersed water in fuel and keep fuel fresh for up to 12 months.

The listed functions extend beyond power: PROGREEN says the additive reduces rough idle, stalling, fuel consumption, emissions, and rust, while binding dispersed water in fuel. The stated 12-month fuel-freshness period may suit vehicles or fuel supplies that sit between uses. Its compact 2.7-ounce can is easy to store, but the supplied details do not specify engine compatibility, dosage, or the conditions behind the horsepower and torque claims.

Skip it if you need clearly stated gasoline or diesel compatibility and dosage; Lucas Oil 10003 lists both fuel types and specific system targets.

Drivers seeking the listed throttle-response and fuel-freshness functions may consider this compact shot, particularly for fuel that sits between uses. Its compatibility and dosing details are not supplied, so it is a less clearly specified option for a particular engine.

Listed on Amazon as: Ultra Sport Multifunctional Fuel Additive/Catalyst/Stabiliser/Energy Booster Shot/Feel Your Drive/2.7 Oz. Cans (1)

#3 · Gasoline Cleaner

3. Hot Shot's Secret Gasoline Extreme

Best for: Gasoline system cleaning.

Why it ranks #3: Its 12-ounce concentrated gasoline formula claims to clean and lubricate fuel-system parts while improving combustion efficiency and engine power.

Hot Shot’s Secret Gasoline Extreme targets a long list of gasoline-system components, including valves, pumps, injectors, rings, pistons, and upper cylinders. That coverage gives gasoline-engine owners a defined cleaning focus; the maker also connects fuel-system cleaning with combustion efficiency, engine power, and fuel economy.

The concentrated 12-fluid-ounce liquid is a manageable bottle size, and the product’s stated gasoline-engine focus helps clarify its intended application. Hot Shot’s Secret says it cleans, lubricates, and safeguards listed components, while claiming fuel economy improvement of up to 7.9% through fuel-system cleaning. That link may appeal to drivers seeking both maintenance and efficiency benefits, though the supplied information does not establish a horsepower figure or provide a treatment rate.

Skip it if you need one product explicitly listed for gasoline and diesel engines; Lucas Oil 10003 covers both fuel types.

Gasoline-car owners looking for a concentrated treatment with named targets across the fuel system may appreciate its broad component list. The supplied details do not give a dosage, so buyers should not assume an application rate or quantified horsepower gain.

Listed on Amazon as: Hot Shot's Secret Gasoline Extreme Fuel Additive, 12 oz

#4 · Injector Cleaning

4. Red Line SI-1

• Weight: 16 oz

Best for: Deposit-focused injector cleaning.

Why it ranks #4: The 15-ounce cleaner targets injectors, carburetors, valves, and combustion-chamber deposits, and includes a synthetic upper-cylinder lubricant.

Red Line SI-1 names injectors, carburetors, valves, and combustion chambers as cleaning targets, giving deposit-focused buyers a clear maintenance scope. Its concentrated detergent blend addresses both high- and low-temperature deposits, while a synthetic upper-cylinder lubricant adds a separate protection-related function.

The 15-ounce bottle combines concentrated high- and low-temperature detergents with a synthetic upper-cylinder lubricant. Red Line states that SI-1 cleans injectors, carburetors, valve deposits, and combustion-chamber deposits, and additional facts specify coverage of GDI injectors. For a neglected vehicle, the directions call for one bottle per tank for the most effective treatment, making the intended intensive-use workflow clear; its auto-racing recommendation may also interest performance-oriented owners.

Skip it if you want a treatment explicitly marketed for vehicles over 75,000 miles; Chevron Techron High Mileage is formulated for that mileage group.

Performance-minded gasoline vehicle owners seeking named deposit targets and upper-cylinder lubrication have a clear reason to consider SI-1. Follow its stated one-bottle-per-tank direction for neglected vehicles, and note that the listing gives no horsepower figure.

Listed on Amazon as: Red Line 60103 SI-1 Complete Fuel System Cleaner – 15 Ounce- Fuel Injector Cleaner and Carburetor Cleaner for Corrosion Prevention and Injector, Valve, and Combustion Chamber Deposit Removal

#5

5. Lucas Oil High Mileage Treatment

• Weight: 5.6 oz

Best for: High-mileage Lucas owners.

Why it ranks #5: This 5.25-ounce high-mileage treatment is relevant to restoring an older vehicle, but the supplied listing does not specify a horsepower claim.

The 5.25-ounce size and high-mileage labeling make this Lucas Oil treatment a compact option for drivers seeking an additive associated with older, higher-mileage vehicles. Lucas says its additives protect engine parts and support fuel efficiency and power, giving this product a mileage-focused place in a horsepower roundup.

Its small 5.25-ounce bottle is easy to store in a vehicle or garage, while the High Mileage Fuel Treatment name identifies the intended audience. Lucas describes its additives as helping protect engine parts and increase fuel efficiency and power, but the supplied product information does not specify a particular cleaning action, treatment rate, or engine compatibility. Buyers should therefore weigh the high-mileage positioning and Lucas brand claims without assuming a specific horsepower increase or application procedure.

Skip it if you need a stated cleaning target, treatment rate, or broad gasoline-and-diesel compatibility; the supplied details do not list those specifics.

High-mileage vehicle owners who want a compact Lucas-branded fuel treatment may find its positioning relevant. The supplied information leaves treatment instructions, engine compatibility, and specific performance outcomes unstated, so it is not a clearly specified choice for a targeted cleaning job.

Listed on Amazon as: Lucas Oil 5.25 Oz. High Mileage Fuel Treatment – 1 Each

#6 · Six-Bottle Pack

6. Chevron Techron Concentrate Plus

• Weight: 4.7 lb

Best for: Multi-vehicle system restoration.

Why it ranks #6: The pack of six 12-ounce bottles targets injectors, intake valves, and combustion chambers, with claims to restore lost power and acceleration.

Chevron Techron Concentrate Plus addresses several drivability symptoms alongside fuel-system deposits, including lost power, acceleration, rough idle, hesitation, and spark-plug fouling. Its 12-ounce concentrated formula comes in a six-pack, giving owners multiple treatments while targeting injectors, carburetors, intake valves, and combustion chambers.

The formula’s listed cleaning coverage spans fuel injectors, carburetors, intake valves, and combustion chambers, so its maintenance scope extends beyond one component. Chevron also ties the treatment to restoring lost power, acceleration, fuel economy, and fuel-gauge sensor operation, while stating improved cold starts and fuel stability for up to one year. The six 12-ounce bottles provide a supply for repeat use; the listing advises following the vehicle owner’s manual recommendations.

Skip it if you need a single bottle for high-mileage-specific care; Chevron Techron High Mileage is formulated for vehicles over 75,000 miles.

Drivers addressing deposits and several listed drivability symptoms may value Techron’s broad system coverage and multi-bottle supply. Follow the owner’s manual recommendation, and consider the pack format if you have limited space or need only one treatment.

Listed on Amazon as: Chevron 67740-CASE Techron Concentrate Plus Fuel System Cleaner – 12 oz. (Pack of 6)

#7

7. Chevron Techron High Mileage

• Weight: 12 oz

Best for: Cars beyond 75,000 miles.

Why it ranks #7: This 12-ounce formula is intended for vehicles over 75,000 miles and claims to restore lost power by removing gum, varnish, and deposits.

Chevron Techron High Mileage is specially formulated for vehicles with more than 75,000 miles, giving older passenger cars, light trucks, and SUVs a defined fit. Its stated functions include removing gum, varnish, and other deposits to restore power and performance while protecting fuel-system components from corrosion.

This 12-ounce treatment covers gasoline-powered modern and classic passenger cars, light trucks, and SUVs, including carbureted, two-stroke, and port-fuel-injected engines. Chevron says it removes gum, varnish, and other fuel-system deposits, linking cleaning with restored power and performance. Multiple corrosion inhibitors protect both ferrous and non-ferrous metal components, including the fuel-gauge sensor. That combination makes it relevant to high-mileage maintenance where deposit removal and corrosion protection are both priorities.

Skip it if you need a treatment explicitly listed for diesel fuel; Lucas Oil 10003 is specified for both gasoline and diesel engines.

Owners of gasoline-powered vehicles beyond 75,000 miles can choose this for its mileage-specific focus, deposit removal, and corrosion inhibitors. Its listed vehicle scope is passenger cars, light trucks, and SUVs, so other equipment types are not specified.

Listed on Amazon as: Chevron Techron High Mileage Fuel System Cleaner, 12 oz, Pack of 1

#8

8. Gumout Multi-System Tune-Up

• Weight: 0.112 oz

Best for: Multi-fuel engine maintenance.

Why it ranks #8: The 16-ounce treatment claims to clean GDI injectors and carburetors across gasoline, diesel, and ethanol engines, but gives no specific horsepower claim.

Gumout Multi-System Tune-Up is listed for gas, diesel, and ethanol engines, making fuel-type flexibility its clearest practical distinction. It targets GDI injectors and carburetors while also claiming fuel-system cleaning, deposit removal, and protection against future carbon buildup across vehicles and equipment such as lawn mowers.

The 16-ounce treatment’s stated compatibility with gasoline, diesel, and ethanol engines broadens its use across cars and lawn mowers. Gumout says it cleans GDI injectors and carburetors, removes deposits and residue, and helps prevent future carbon buildup. Those functions connect current cleaning with ongoing system maintenance, while the multi-system positioning suits owners of varied equipment. The supplied details do not specify a treatment rate or quantify a horsepower increase, so its power benefit is not numerically defined.

Skip it if you specifically need a treatment formulated for vehicles over 75,000 miles; Chevron Techron High Mileage names that mileage range.

Owners maintaining different fuel-powered engines may value the broad fuel compatibility and injector-and-carburetor cleaning claims. Choose it for multi-system upkeep rather than a quantified horsepower result, since the supplied product details provide no dose or power figure.

Listed on Amazon as: Gumout 510011 Multi-System Tune-Up, Fuel Stabilizer Injector Cleaner & Gas Treatment, 16 oz, Full Fuel System Cleaner – Improves Engine Performance, Cleans & Removes Deposits and Residue

#9

9. Star Tron Enzyme Treatment

• Weight: 1.02 lb

Best for: Ethanol-blend gasoline upkeep.

Why it ranks #9: Its enzyme formula is described as improving fuel combustibility and power, with additional claims for ethanol-related water and sludge issues.

Star Tron’s enzyme treatment explicitly addresses ethanol-blend gasoline, using a proprietary enzyme blend to improve fuel combustibility. The supplied description connects that action with more power and better fuel economy, while also describing cleaning across the fuel delivery system, including the tank and carburetor.

Its enzyme technology is described as helping engines start easily and run smoothly, including when using ethanol-blended fuel. Star Tron also says it breaks down excess water and sludge into sub-micron particles that can be burned during normal operation, linking fuel cleanup with routine engine use rather than a separate removal step. The gasoline concentrate’s stated system-wide cleaning and ethanol focus suit owners concerned with fuel quality; the supplied details do not state a dose or horsepower figure.

Skip it if you want an additive with a stated 12-month fuel-freshness period; PROGREEN Ultra Sport lists that storage-related benefit.

Gasoline owners using ethanol blends who want enzyme-based fuel-system care may find this relevant, especially when water or sludge is a concern. The listing supplies no dose or quantified power result, so those seeking precise performance figures should look elsewhere.

Listed on Amazon as: Star TRON Enzyme Fuel Treatment – Gasoline

#10

10. Star Tron Gas Stabilizer

Best for: Stored gasoline and ethanol blends.

Why it ranks #10: This version emphasizes stabilizing old gasoline and general engine performance rather than a specific horsepower or fuel-system cleaning claim.

Star Tron Enzyme Fuel Treatment specifically addresses gasoline that has sat idle for months as well as fuel used daily, giving storage and regular-use owners a shared option. Its enzyme technology is also described as working with ethanol-blended and ethanol-free gasoline, broadening its stated fuel fit.

Star Tron says its enzyme technology helps engines start easily and run smoothly, including with ethanol-blended fuel, and breaks excess water and sludge into sub-micron particles that can be burned during normal operation. Those claims connect fuel treatment with everyday running rather than requiring a separate sludge-removal process. The 16-fluid-ounce capacity offers a larger supply than a small shot, while the supplied information does not specify a dose or a horsepower figure.

Skip it if you need a clearly stated dose and component-by-component cleaning targets; Red Line SI-1 lists its targets and direction for neglected vehicles.

Owners of gasoline engines that alternate between regular use and long idle periods may appreciate the stated storage-related fit and ethanol compatibility. The listing does not provide a treatment dose or horsepower measurement, so those details remain unspecified.

Listed on Amazon as: Star TRON Enzyme Fuel Treatment – Gas, Stabilizes Old Gasoline