July 8, 2025

Advertising Disclosure

10 Best gas additive for cars of 2025

Save up to 40% off

Best Choice

1

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

Improves Fuel Efficiency and Quality
One 5.25 fl oz bottle of STP Gas Treatment improves the quality of gasoline, helps maintain fuel efficiency, and prevents the build-up of harmful deposits.

Ideal for Regular Use in All Vehicles
Use this gas additive regularly when you fill up your tank to prevent fuel line freezes and maintain a clean fuel system.

Praised for Increasing Gas Mileage
Customers frequently praise STP Gas Treatment for helping increase gas mileage, with some reporting an additional 30-45 miles per tank.
9.8

Exceptional

Our Rating

9.9
Simple to use

9.1
worth the money

9.1
distance
How do we rank?

Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you

Careful review Our team ensures quality, value, and fit based on real user feedback

Trusted insights AI and human analysis guide your decisions, reflecting real user priorities
Real users impact

Thousands of users trust our site daily

Based on millions of stores and reviews

Shoppers influence our rankings
Analyzing top stores
Value for Money

2

Red Line
Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce
Main highlights

Comprehensive Cleaning Power
Red Line SI-1 effectively cleans injectors, carburetors, and valves.

Ideal for Older Vehicles
Best used in vehicles with suspected fuel system fouling.

Notable Mileage Improvement
Customers report significant gas mileage increases after treatment.
9.5

Excellent

Our Rating

9.7
Simple to use

9.5
quality of ingredients

9.3
worth the money
3

STA-BIL
STA-BIL Fuel Stabilizer - 16oz
Main highlights

Preserves Fuel Freshness up to 24 Months
Keeps fuel fresh for up to 24 months, preventing degradation and ensuring quick, easy starts for stored vehicles and equipment.

Ideal for Seasonal Equipment Storage
Perfect for storing gasoline in lawnmowers, generators, boats, and recreational vehicles, protecting the fuel system from corrosion and degradation.

Highly Praised for Easy Engine Starts
Customers frequently commend the product for ensuring engines start smoothly after long storage periods, enhancing reliability and performance.
9.4

Excellent

Our Rating

9.7
Simple to use

9.5
worth the money

9.5
Stability
4

Lucas Oil
Lucas Oil 10003 Fuel Treatment - 1 Quart

16% Off
Main highlights

Fuel System Efficiency
Cleans and lubricates the fuel system, improving MPG and reducing emissions.

Versatile Application
Ideal for gasoline and diesel engines, including older engines needing lead replacement.

Customer Praised Performance
Highly effective in restoring engine power and smooth operation.
9.1

Excellent

Our Rating

9.9
Simple to use

9.7
worth the money

9.5
Long life
5

STP
STP Complete Fuel System Cleaner, Fuel Cleaner Deep Cleans Entire Fuel System, 5.25 Oz, Multicoloured, 1 Count (Pack of 1)

10% Off
Main highlights

Fuel System Cleaning
Removes deposits from entire fuel system to restore performance.

Ideal for Cap-less Fuel Tanks
Compatible with cap-less fuel tanks, making it user-friendly.

Check Engine Light Solution
Frequently praised for turning off check engine lights.
9.0

Excellent

Our Rating

9.9
Simple to use

9.5
worth the money

9.3
distance
See Today’s Deals & Prices
6

STP
STP Ultra 5 In 1 Fuel System Cleaner and Stabilizer, Deep Cleans Fuel System and Fights Engine Friction, 12 FlOz

19% Off
Main highlights

Fuel Efficiency and Emissions
Formulated to help save gas and lower emissions by deep cleaning the entire fuel system.

Best for Modern Engines
Works with modern gasoline engines such as turbo, direct inject and hybrid vehicles.

Improved Performance
Customers praise its ability to improve acceleration and smooth idle.
8.9

Very Good

Our Rating

9.9
Precision

9.5
Simple to use

9.1
worth the money
7

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% Off
Main highlights

Efficient Filtering and Water Separation
Keeps fuel line clean and free of water, preventing rust and corrosion for smoother engine operation.

Perfect for Winter Starts
Ideal for ensuring fast cold weather starts by preventing gas-line freezing in all 4-cycle engines.

Reliable Moisture Absorption
Customers praise its ability to absorb moisture effectively, protecting the fuel system from damage.
8.8

Very Good

Our Rating
8

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

Superior Water Absorption
Absorbs 5 times more water than regular gas dryers.

Year-Round Engine Care
Ideal for all 2-cycle and 4-cycle gas and diesel engines.

Enhanced Engine Performance
Customers praise improved engine power and smoother operation.
8.7

Very Good

Our Rating

9.9
worth the money

9.9
Simple to use

9.9
sweat control
9

STA-BIL
STA-BIL In-Season Protection Fuel System Treatment | Full Protection Fuel System Cleaner, Injector Cleaner, Increases MPG, Prevents Corrosion, 10 Fl. Oz.

23% Off
Main highlights

Complete Fuel System Cleaner
STA-BIL 360 Protection thoroughly cleans from injectors to pumps, preventing corrosion.

Year-Round Ethanol Protection
Ideal for maintaining engine health in ethanol-blended fuels all year.

Quick Start and Smooth Operation
Customers praise quicker engine starts and smoother performance.
8.5

Good

Our Rating

9.9
Simple to use

9.9
Stability

9.5
worth the money
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

17% Off
Main highlights

Deep Fuel System Cleaning
Cleans, lubricates, and protects the entire gasoline fuel system and engine components.

Ideal for Performance Restoration
Acts as an engine flush to dissolve deposits and restore engine power.

Praised for Enhanced Throttle Response
Customers appreciate improved throttle response and fuel economy after use.
Key specs
- fuel type:Gasoline
- special features:Deeply cleans, lubricates
- product dimensions:N/A
- item size:N/A
- package dimensions:N/A
8.4

Good

Our Rating

10 Best gas additive for cars of 2025

1

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

9.9

9.1

9.1

How do we rank?

How do we rank?

Analyzing top stores

2

Red Line 60103 SI-1 Complete Fuel System Cleaner, Cleans and Prevents Corrosion in Fuel Systems, Cleans Injectors, Carburetors, Valve and Combustion Chamber Deposits - 15 Ounce

9.7

9.5

9.3

3

STA-BIL Fuel Stabilizer - 16oz

9.7

9.5

9.5

4

Lucas Oil 10003 Fuel Treatment - 1 Quart

9.9

9.7

9.5

5

STP Complete Fuel System Cleaner, Fuel Cleaner Deep Cleans Entire Fuel System, 5.25 Oz, Multicoloured, 1 Count (Pack of 1)

9.9

9.5

9.3

6

STP Ultra 5 In 1 Fuel System Cleaner and Stabilizer, Deep Cleans Fuel System and Fights Engine Friction, 12 FlOz

9.9

9.5

9.1

7

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.

8

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

9.9

9.9

9.9

9

STA-BIL In-Season Protection Fuel System Treatment | Full Protection Fuel System Cleaner, Injector Cleaner, Increases MPG, Prevents Corrosion, 10 Fl. Oz.

9.9

9.9

9.5

10

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

Sign up and get exclusive special deals