Best Fuel System Cleaners of 2025

“I've made Chevron Techron Concentrate Plus a staple in my car maintenance routine, especially for my Kia Forte. The cleaning efficiency is impressive, removing carbon deposits and keeping my engine running smoothly. I’ve noticed an improvement in fuel economy and smoother acceleration after each treatment. Plus, the easy-to-use bottles are a big plus!”

“Based on a recommendation from a colleague, I started using this product and I’m really pleased with the results. After adding it to a full tank, I quickly noticed a boost in my vehicle's performance and fuel economy. I’ll definitely keep using it and recommend it to others.”

“After struggling with a faulty fuel gauge in my C6 Z06, I tried Chevron’s Techron Concentrate Plus and it worked wonders! It resolved the gauge issue and improved my engine’s responsiveness. I highly recommend it to anyone facing fuel system problems!”

"I have used this product several times, and in my recent experience, it seemed to help clear an engine code—possibly cleaning a fuel injector. All good!"

"After using this on my 2015 Volvo V60, my gas mileage improved from about 20 mpg to 23.3 mpg and continues to rise. It's more effective than Techron, although I think using it every oil change is a bit excessive."

"I added this product to both of my cars, and I genuinely believe it delivers on its promise. It cleans fuel injectors and improves gas performance, leading to a better driving experience and increased mileage."

"I've found that this product works well in my small equipment like pressure washers and lawn mowers, keeping the fuel system clean and functional. It's a small price to pay to avoid bigger problems with today's gas quality."

"After using the Chevron fuel system cleaner on two fill-ups, my fuel gauge issues in my 2006 Toyota 4Runner have resolved. It now works consistently after being erratic for a while. I've even ordered a few more bottles just in case!"

"I've been using fuel treatments for a long time, and I can say that Chevron Techron is one of the best. This is my first time trying the High Mileage version, and I believe it's just a more concentrated form of the regular product."

"I've heard from many that this stuff really works. After using it in one of our vehicles, we noticed a boost in fuel mileage."

"Having used BG Product for many years, I can affirm it has a proven track record. I know mechanics who swear by it."

"I had a check engine light issue in my 2018 Honda Fit EX-L. After trying a few fixes, I decided to use this product based on its great reviews. I added it to a fresh tank, and after running my car hard, the engine light turned off and hasn't returned for 1,000+ miles. I highly recommend it as a first step for anyone facing fuel injector warnings."

"After using Gumout, my Honda Civic LX runs a lot smoother daily. Great stuff!"

"I noticed a significant increase in performance with my older hemi engine. This product helps lubricate everything and decreases leakage. It's super easy to use and a high-quality product overall."

"I used Gumout in both of my older cars, and I saw improvements. The lagging stopped, and I gained about 5 MPG in both vehicles. It’s not a miracle solution, but it definitely helped smooth out the idle and response, so I'm planning to keep using it."

"After using Liqui Moly 2030 Pro-Line Gasoline System Cleaner, I noticed an immediate improvement in my car's performance. The engine runs smoother, acceleration is more responsive, and fuel efficiency has slightly improved. It also helped reduce rough idling and hesitation. Definitely a great product!"

"I've been using this product for years on two cars over 200k miles and they are running like a top. I can confidently say it works!"

"For my 2017 BMW 440i GC, I noticed it working right away. I had a sluggish throttle response, and after using this, I experienced a more consistent throttle response and a better exhaust note. My wife even noticed the difference!"

"I have six vehicles that my three children drive. I put this product in every 2,500 miles, and it works remarkably well in keeping the fuel injectors clean and the cars idling smoothly. I highly recommend it!"

"I always find a great deal with this product, cheaper than anywhere else. I double dose for three tanks, and now my gas mileage improved from around 26 highway to 27.5 at 70 mph!"

"I've been using this cleaner in my 2007 Toyota truck for years. I add it to maybe every other tank, and I can tell my car runs very smoothly. No rough idle, no need for new fuel injectors. I’m continuing to use it because it seems to be doing its job well!"

"I experienced amazing results with Berryman B12! After treating my car, my average city mileage improved from 14-15 mpg to 20-21 mpg. The car feels more responsive, and I couldn't be happier with the performance boost!"

"This product is incredible! I mixed one bottle with a full tank, and the next day, my engine was back to full efficiency. No more shuddering or RPM fluctuations. I will definitely continue using it regularly."

"I had a clogged fuel injector problem, and Berryman B12 worked wonders. After following the recommended method, my engine performance was restored completely. This product is absolutely worth it for anyone facing similar issues!"

"I have a 2002 Chevrolet Silverado with a 5.3L engine. After using two bottles, I noticed a significant improvement in performance and fuel economy within the first 100 miles. My highway MPG increased to almost 19!"

"As a retired auto tech, I use this to keep the fuel system clean in our vehicles about every 2000 miles. I also add it when the vehicle is going to sit for a while, especially because we live in a cold area where condensation can build up in the fuel tank."

"My 2004 Durango had been running rough, and the check engine light was on for months. After trying the Gumout fuel system cleaner, the light turned off, and the vehicle runs like new! I’m amazed at how this product worked."

"I've personally used BG products since the late 90s. This is the best fuel additive I've encountered. I use it every few months to tackle carbon deposits, especially in today’s turbocharged and GDI vehicles. Avoid cheap gas, and this product will help maintain your engine's cleanliness."

"This stuff keeps my Ducati running smoothly. I can definitely feel the difference when I use it. While it’s not cheap, it’s highly effective for enhancing performance."

"I own a 2007 Honda Civic with high mileage. After using the BG fuel system cleaner, the engine ping is gone, and I don't need premium fuel anymore. It works as promised!"