Best Fuel Additives of 2026

"I had trouble getting my Toro snowblower to start—even after using fuel stabilizer, it wouldn't run smoothly. After using this product and letting it sit overnight, my snowblower fired right up and ran perfectly. I let it run for 15 minutes, and now it's like new. Saved me a lot of money on repairs!"

"During a recent snowstorm, my snowblower completely stopped and wouldn't restart. I poured this into the gas, followed the instructions, and let it run for 15 minutes. Next storm, my blower kept going strong and even cleared my neighbors' driveways. This stuff really works!"

"I had a generator with a gummed-up carburetor that I couldn't fully fix by hand. After running this Fast Fix through it, the engine became much smoother and more reliable. It's not a miracle cure, but if you can't do repairs yourself, it's definitely worth a try."

"After several uses of this fuel treatment, I've noticed my car runs smoother and my fuel efficiency has improved. It's been especially useful on long drives, and I appreciate that it's affordable and easy to use even in cold weather. Overall, it's a smart buy for keeping my vehicle healthy."

"I've used this product for years and the difference is clear—better mileage, smoother operation, and cleaner injectors. Using it in both my gas and diesel engines, I see a noticeable performance boost and cost savings. Just make sure not to overdo it, as too much can potentially affect your spark plugs."

"When I started adding this to both my Honda Civic and BMW, I didn't see immediate changes, but after a few tanks, the engines ran much smoother, idling improved, and the cars started faster. I recommend using it consistently over several fill-ups for the best results. It's a great value, but don't expect instant improvements."

"I've relied on this product for years, and it consistently keeps my fuel from gelling in harsh winter conditions. It also helps maintain clean injectors, which is crucial for my vehicle's performance."

"This is the only additive I trust for my F350. Even lab tests back up its effectiveness, and I haven't found anything else that works as well. It's my go-to every season."

"After forgetting to treat my diesel truck this winter, I had issues with fuel gelling during a cold snap. Once I added this product, the problem was completely solved—even when the weather got even colder. Highly dependable anti-gel solution."

"I've used this product in everything from my Harley Davidson motorcycles to mowers and camp stoves, and the results have been incredible. My engines run smoother, I get much better mileage, and even after years in storage, the fuel stays fresh and the tanks are spotless. I trust this stuff for all my power equipment, and it really does what it claims. Highly recommended for anyone who wants to keep their engines running better for longer."

"Star Tron has been a complete game-changer for me. No more gummy messes or hard starts in my outboard motor and yard equipment—even after months of sitting idle, everything fires up right away and runs smoother than ever. I even used it in a friend's chainsaw, and he was amazed at the difference. For anyone dealing with ethanol-blended fuels, this is a must-have."

"I use StarTron in all my small engines, both 2-stroke and 4-stroke, and it has completely eliminated carb issues, even with ethanol-free gas. My ATVs and other machines can sit for months and still start up with no trouble. I've had issues with other fuel stabilizers, but this one works better than anything else I've tried."

"I've used this in my 2008 Cadillac Escalade and my lawn mowers, and after just 100 miles, I noticed my car idled and ran much smoother. It's a solid product that genuinely improves how my engines perform."

"After switching from another brand, I began using this on my old Poulan Pro lawnmower, chainsaws, weed eaters, pressure washers, generators, and even my 2019 Subaru SUV. Every engine ran better, and my Subaru's acceleration improved with MPG increasing from 27.9 to 28.9—the best I've seen. Even fuel stored for months started up my generator like new. I absolutely recommend this for gas treatment and storage."

"I first found this at a marine store and was skeptical, but after using it for over a decade in my outboard, push mower, and motorcycle, I've had zero problems with fuel gumming or ethanol separation—even with gas stored for over a year. It even cleared partial clogs in my outboard. Now, I rely on this for all my small engines, and they always run efficiently with no issues."

"I always rely on this treatment for my boat. It keeps my engine running smooth after storage, and I no longer worry about bad gas or ethanol problems. My old engine used to misfire on stored fuel, but with this, I have zero issues, even after months. I've even recommended it to friends."

"I've been using STA-BIL Marine for years and consider it as essential as a life jacket. Whether it’s my old outboard or my new Yamaha, I trust this treatment to keep everything purring after winter layups. It’s like having a personal mechanic in a bottle."

"I use this product in all my gas-powered equipment, from the boat to my lawnmower. It completely solves ethanol-related problems and noticeably boosts fuel mileage in my cars. Buying the big jug and refilling smaller bottles has also saved me a lot of money."

"I had trouble starting my gas-powered weed eater and had to return it multiple times for service. After using this product as directed, it now starts in five pulls or less, which is a huge help for someone with limited arm strength. I highly recommend it for all gas-powered tools and vehicles."

"After watching a mechanic demonstrate this product dissolving water in gasoline, I gave it a shot. This spring, all my equipment—trimmers, chainsaw, mower, splitter—started up perfectly after sitting all winter, even in our humid, rainy climate. I’m sticking with this from now on."

"I use this in my yard equipment and cars to protect against water retention and carburetor issues. I haven’t tried my own bottle yet, but a friend shared some with me, and I’m confident it will help keep my older vehicles running smoothly while in storage."

"I've relied on this product for three years and it has dramatically improved my lawnmower performance. Each spring, my old and new mowers start on the first or second pull, which is a huge help since I'm a senior and need reliable equipment. It keeps my gas lines clean all summer and makes starting so much easier—no more struggling and getting exhausted! The bottle lasts for years and is a real bargain compared to local stores."

"Adding STA-BIL to my fuel before storing my machines has made a huge difference with smooth spring startups. It’s incredibly simple to use—just pour and go. After an entire winter, all my equipment started immediately with no fuss. I love that it keeps fuel fresh for up to two years. This product is now a permanent staple in my garage, right beside my toolkit."

"As a longtime user, I can say this is the only fuel stabilizer I trust. After seeing a five-year test on YouTube proving it works best, I'm convinced. I’ve stopped wasting money on other brands—this one truly preserves my engines and keeps them running smoothly, year after year."

"I've noticed my small engines start effortlessly with this fuel, even after long periods of storage. It's a bit pricey, but I use so little each year that it’s worth it to avoid the hassle of hunting down ethanol-free gas. Definitely better for engine longevity."

"I used to mix my own gas and oil for our trimmer, but after trying this, we won’t go back. It’s so much easier and the equipment runs great. My family repeatedly buys this because of the convenience and reliability."

"After some bad experiences with ethanol fuel ruining my snowblower carburetor, I switched to this product. Now my equipment starts on the first pull and runs smoothly. Plus, the long shelf life means I don’t worry if it sits for a while. A must-have for infrequently used tools."

"I've been using this product for years and my cars consistently run clean, even after hundreds of thousands of miles. Mechanics often mention how spotless my engine is during checkups. It’s a reliable product that helps my vehicles last much longer."

"With over 180,000 miles on my car, I wanted something to help it last. This product is easy to add at fill-up, mixes well, and keeps my car’s parts clean. Plus, I found it cheaper online than in stores."

"I needed better mileage for my older vehicle, and after using this, I now get over 500 miles per tank. It’s easy to use, a great value, and there’s no mess or leakage if used properly. Just make sure to read the directions for best results."