Best Octane Boosters of 2026

"I've put this in my Harley and, with all the engine upgrades, it’s made a significant difference—no pinging at all and runs much smoother. I get more for my money with the 15-ounce bottle compared to other brands."

"Using this in my Camaro, I honestly felt the engine ran smoother and responded more quickly, making the drive feel more powerful. Maybe it’s just me, but it definitely enhanced the driving experience."

"I run this in multiple vehicles, including OHV toys, and the octane increase is very noticeable compared to regular gas. For anyone not needing full racing fuel, this is the best option for both performance and price."

"When I use this product in my VW 2.0L turbo engine, I get comparable performance with regular 87 octane as I do with premium 93 octane. It's made a noticeable difference in how my car runs."

"I started adding this to my Mustang even though it runs fine on 87 octane, and over time, I've noticed better throttle response and extra pep. Plus, it helps keep my fuel system clean, which gives me peace of mind about ethanol-related issues. It's an affordable way to get the benefits of premium fuel."

"I use this regularly in my older truck, and it gives my fuel system a noticeable boost every fill-up. It's easy to use and feels like a solid quality product."

"I’ve got an older Jeep that sometimes sits unused, and whenever I run into starting problems or rough idling, I just pour in a bottle of this and after a drive, the engine runs as smooth as the day I bought it. It’s saved me countless trips to the mechanic for tank cleaning, and I always keep a couple bottles on hand. It really makes life easier when I need to get my car going again."

"I added this to my Ford SVT Lightning, which often sits for weeks between drives. After mixing it with my usual 93 E10 gasoline, I could immediately feel an improvement in power. I was honestly surprised by the noticeable boost, and I think the computer even advanced the timing a bit, which is exactly what I wanted from an octane booster."

"I’m using this in my 6.4 Hemi while towing a 35ft trailer, and I’m still getting solid gas mileage—about 12mpg. That’s the main reason I bought this truck, and I’m really happy with the results I’m seeing with this product."

"After switching from Lucas to this octane booster, I immediately saw a huge improvement in engine power in both my GMC Sierra and Mazda CX50 Turbo. Both turbo and non-turbo engines respond better, and the overall performance is just more satisfying."

"I rely on this product for my Harley, especially since lower quality pump gas can be an issue. The bottle fits perfectly in my swingarm bag and I can get several fill-ups from one bottle. I honestly wouldn’t ride without it."

"This octane booster delivers real results like increased mpg per tank and cleaner emissions, but the recent price hikes are disappointing. If the price continues climbing, I might go back to buying premium gas instead."

"After adding this to my 2018 Grand Cherokee, I've noticed the car runs much better. The performance improvement is clear and it works exactly as needed."

"My tuner detected some ignition knock on my car, so I tried this octane booster. After using it for a few weeks and adding it before each fill-up, the knock disappeared and my car now feels smoother with better gas mileage and torque. I'll definitely keep using it."

"I use this every 2,000 miles to keep my car’s injection system clean. Pouring it into a half tank and driving for a day really makes a noticeable difference. It’s a great product that isn’t harmful to my engine."

"I've been using this in my boosted small block and my 11:1 Windsor, and I can confidently say it works great for high-compression engines. It consistently delivers the performance boost I need."

"When I mix this with 91 octane in my 2017 M8 Road King, I immediately notice smoother engine operation and earlier shift points. There's less popping during engine braking, and I think my fuel mileage has even improved a little, though I haven't done a direct comparison yet."

"Every time I add half a can to my '22 Mustang GT, the increase in power and torque is obvious—it honestly feels like a 20 horsepower jump! My exhaust even sounds meaner. I'd use it all the time if it weren't so expensive, but if you want a quick power bump, this stuff is a must-try."

"I've relied on this fuel injector cleaner for over 20 years with multiple vehicles, and it really offers cheap insurance against fuel system issues. I even use it in my old push mower and motorcycle, both still running strong. No one’s paying me to say this—I’d recommend it to anyone."

"Running a tuned Turbo Mazda 3, I can tell when gas quality drops—the car loses power. Tossing a bottle of this in and things are back to smooth performance. The only minor gripe is the over-the-top marketing on the label, but the product really helps when octane quality is questionable."

"My 2002 Land Rover Discovery is supposed to take premium gas, but with prices up, I switched to regular and noticed sluggish performance. After using this, the car’s response improved right away, saving me money at every fill-up. I don’t usually write reviews, but this was worth it."

"I noticed a significant improvement in my car’s fuel efficiency and smoothness after using this cleaner. The application couldn’t be simpler—just pour it in and go. I really appreciate having a pack of six on hand for regular use. If you want better mileage and a healthier engine, this is a must-have."

"After reading reviews and doing my homework, I tried this in my older Camry. The rough idle issue disappeared by the end of the tank, and now I’m planning to use it at every oil change. It even cleans the intake valves, which makes it even more valuable for my maintenance routine."

"I saw a video by Scotty Kilmer where he tested this product, and the results were impressive—cylinders were visibly cleaner, with less carbon and dirt. After trying it myself, my car’s acceleration and idle feel like new, and it’s now a regular part of my maintenance every few months."

"I've got a couple of older cars with soft valve seats that need extra protection, especially since ethanol gas is so harsh on them. Adding this along with SeaFoam helps keep things running smoothly, even if people give me funny looks at the pump—my engine’s longevity is worth it!"

"After using this in my Harley with some performance upgrades, I noticed a definite improvement in both low and high-end power. This stuff is top quality and delivers real results."

"I split a bottle between two tanks in my old four-cylinder with over 230,000 miles, and I think I’m seeing a bit more power and a smoother idle. Maybe it just cleaned things up a bit, but it’s running pretty well now—worth trying!"

"I've tried several octane boosters, but 104+ is the first one that actually delivered noticeable gains on the road and dyno. The throttle response and acceleration are dramatically improved once fully mixed in the tank. This product truly makes a difference, especially in turbo V6 and V8 engines."

"I've relied on this octane booster for years because it consistently increases power and keeps my fuel injectors clean, just as advertised. It's a staple in my garage for a reason."

"After buying a JDM car, I realized it needed higher octane, so I added 104+ to 91 octane gas. The engine felt much smoother and performed better. For the value, it's a great product for imported vehicles."