In-Season Fuel System Treatment & Injector Cleaner, 10 oz 12-Pack

This product seems to work well I put it in every time I fill up I think the gas and it seems to get better gas mileage.

I believe it works; at least for me. Timely delivery.

Good fuel treatment. Helped protect the lawnmore I’m buying this again

Maybe I'm OCD, but I want to add the additive into the gas tank BEFORE pumping in the gas, to make sure the additive mixes into the gas. If you need 1 ounce of STA-BIL for every 5 gallons of gas, then you're going to have to know how many gallons of gas you're going to pump so you can calculate how many ounces of STA-BIL to put in the tank, first. It's a bit of an imposition. I let the tank drop to just below 1/2, and then pump 10 gallons. But first, I add 2 oz of STA-BIL. Or if the tank has a bit more than half, I'll predict on pumping 7.5 gallons, and put in 1 1/2 oz of STA-BIL, first. Works for me, your gas gauge may vary. First time I've ever used this kind of dispenser. It's easy to use, except you'll need a little light, and possibly reading-glasses, to see the markings on the bottle. There are markings for 1/4 oz, 1/2 oz, 3/4 oz, and 1 oz, if I recall correctly. And I figure a little more than the instructed ratio is better than not-enough, if you're going to err. I read an ethanol protectant is beneficial for older engines like a 1999 4 cylinder Toyota engine with 103k miles, that the older the engine the more prone they are to ethanol damage, and that ethanol protectant can reverse some damage -- whatever that means. Maybe it just dissolves away existing corrosion and then it continues to protect against more corrosion occurring. Maybe the gas companies should put ethanol protectant in the gas with the other additives so we don't have to perform this exercise.

Works Great!

This is hands down the best value for money fuel system cleaner on the market. So in 2026 we’re fighting a losing battle with fuel system deposits and all kinds of issues with ethanol gasoline. “Top tier” fuel stations like shell and chevron help, but it’s impractical to go to top tier stations 100% of the time. That’s why I like this stuff so much. I always buy the largest bottle of this stuff, and I add 5oz on an empty tank to my truck, 4oz if I fill up on a 1/4 tank. That means the large 32oz bottle is good to fill my pickup trucks gas tank 6-8 times with this stuff. So for about $15, I get 6-8 tanks of gas worth of a strong PEA fuel system cleaner, that’s an incredible value. I just leave it in my trucks toolbox and always add the 4-5oz at the gas station before I fill up, it’s like muscle memory now. I personally prefer this fuel system cleaner procedure over the much more aggressive cleaners you empty an entire bottle of every oil change. This is a much more gradual (yet still effective) process that you add every fuel tank. This is a fantastic proactive maintenance item that I highly recommend.

I bought this, the first time, by accident for my lawnmower. Once I realized what it was I decided not to use it in the lawnmower, but dump it in my car. I really didn't expect anything. Boy was I wrong!! At first, obviously, there was little change, but after 30 minutes or so I pulled out from a side street onto a main road and was caught completely by surprise when my car took off like greased lightening!! Much stronger than I was normally accustomed to. My car has a 6.1L Hemi, so it's a big engine with lots of power to begin with (425hp). The difference in power and responsiveness from the engine after adding this stuff was simply incredible. That's not the best part though. The biggest surprise (to me) was the increase in gas mileage. I normally run between 13.5 and 14.0 mpg around town and 20.0 to 22.0 on the highway. I"ve not had a chance to check my highway mileage, but around town I'm now getting between 14.8 and 16.5!! Not a big deal you say? Think about it. The smallest increase is almost 10%, the largest is nearly 22%. Okay, in different terms. I have to run premium fuel, which is real close to $4/gal. Let's say the increase is only 1 mpg. Over the course of one tank of fuel (16 gals), that is nearly a gallon of gas saved. Total savings. $4. It nearly pays for itself, reduces the amount of fuel I burn, thus less emissions, and it gives me more power. Can't argue that logic! Better yet, using the best case scenario of 3 mpg increase, the savings really adds up. 3 mpg * 16 gals = 48 miles. 48 miles / 16 mpg = 3 gals. 3 gals * $4 = $12. This stuff is now saving me money. On average, I find the savings I receive from using this stuff far exceeds its cost. Yes I have ran a tank of gas through the car w/o using this product since, and yes I noticed a difference, both mileage and power. My next experiment is to put it in the minivan. Maybe I'll report back again then. If you would have told me this stuff would make a difference I would have called it snake oil. All I can say is, go buy one bottle and you WILL notice a difference. You'll pay about $8/bottle at your local parts store though.

Works great.

Good price. 10% ethanol in gas, some places more. That's 2 gals per every 20 gallons. Read up on it and you'll understand why I purchased Stabil. Have to counteract that stuff. Going to give this a try. Used it a long time ago for storage and seemed to do good. No complaints. If this holds up I'll be a regular purchaser.

Product feels premium.... With 100 percent certainty......Bike throttling feels way much better and smoother........ can't say about average...........so.....will definitely continue this product in future .. using this in Honda shine BS4....Bike

Seams to work great in all gasoline engines

Seems to be working but there is no visible proof

This is a great product. Follow the directions as you don’t need much for a 20 gallon tank . I use this on my classic car , lawn mower, anything that sits for an extended period . It will keep the gas stabil and ready to use , even 4 months after using . Otherwise your fuel line and carb may be clogged with varnish from stale fuel.