STP Octane Booster for Gasoline Fuel Additive, Restore Lost Power, 5.25 oz

Used to have a high octane fuel only vehicle and so does my father and adding half a bottle to the tank and filling up with regular gas neither of us have had any issues ever with this octane booster. Price of high octane is usually around a $1 more a gallon so using this has saved a lot of money

Do not buy this if you are thinking it will improve your vehicle's performance in some way. I made that mistake of ignorance myself when first grabbing a bottle off the gas station shelf. It likely won't hurt your engine to use one bottle per 15 gallons (they say up to 20), but it's just not what most people think it is/does. **edit*- this DID cause transmission damage, knocks, and pings on my naturally aspirated system. I mistakenly thought that my variable octane (87-93) engine and drive train could handle this change in octane. This was my mistake, I was wrong, and this shouldn't be used on a naturally aspirated engine unless the gas has been sitting for ~6 months and has gone stale. Check with your dealer about your specific vehicle make & model.* Octane boosters raise the octane level of your fuel, making it MORE difficult for gasoline to combust under pressure. They get a bad rap as they're sold as performance enhancers, or speed boosters. High-revving, high psi turbo/supercharged engines can benefit from this as it leads to increased efficiency of combustion. High-octane fuel requiring performance cars that only have access to 87 octane gas stations, or fuel that's been sitting around a few months or more can benefit from this too. You can do some research yourself, but if your vehicle does not specifically recommend using an octane booster or a fuel with octane higher than 91 or 93, then it's likely not for you. Maybe if you only have access to low octane gas, but this is an expensive way to boost it by only a little. You're way better off using 93, or 91 octane as your car will take. Using with regular gas if your car takes regular 87 octane gas will do nothing. I use it in a naturally aspirated 3.8L V6 with 104k miles and it was what was causing me knocks around 3rd gear. Typically a fuel system cleaner (and this part is important!) which SPECIFICALLY lists the detergent levels, not just the name of the chemical the detergent used, is a better bet for increasing performance, but still only by a few hp in the best of scenarios on the oldest of cars in the worst of shape over a long time after a lot of uses, and typically is only around up to 0.5hp. This one doesn't even list the detergent I don't think, just that it has 'jet fuel' whatever tf that actually is. It's not fuel for a jet, that's for sure (kerosine is what jet fuel actually is). There are way way better options for boosting performance, and I'm not sure how this would handle in a system that can't take varying levels of octane. Snake oil for many, but it does have it's uses and works for some very specific cases and again, it does not make sense to me yet why. I have some unknown issue, in a 3-year-old car with a ton of miles for the years, which can take variable octane fuels. I likely have some hairline crack in my fuel system somewhere leaking vapor or letting moisture in. **edit*- it was this octane booster which was contributing to my tranmission knocking issue. After stopping use and going down in fuel grade for a month, it's running like new again.*

I get about 40 miles more on a tank on my Volkswagen EOS 2007, so it more than pays for itself each tank.

This product works well

Can’t trust octane ratings so I always use this booster for my high performance cars.

First and foremost, your engine needs a knock sensor to get any benefit from this. If it's not a performance car, it's probably tuned for 87 and may run worse if you add this. If you don't know whether it has a knock sensor, Google it. I added it to a tank of 91 octane gas, and my engine immediately responded with more torque. It was noticable. Not like adding a supercharger, but you can tell it's pushing a few more pound-feet of torque. I suppose this could boost mileage, but it just makes it so much fun to floor the accelerator... I will say that if I go on the freeway and reset the counter, and there's not much traffic, it'll read 35MPG with the air conditioning on all the way until I exit, even if that's 50 miles later. This is in a heavy Acura TL-S with a 3.5L V6. That might be two or three higher than usual. As for city driving, it's worse because, again, it just invites me to accelerate more quickly. Someone with a gentler touch might get better city mileage than me. Hard to say. I make mostly short trips on surface streets, so my mileage is going to be awful most of the time.

Always used

Misleading image. Says treats 21 gallons of fuel. Actual bottle received. 15 gallons. the main image shown says 21. They should update the main image used. Will be using with less full tank than actually thought.

Its a very useful product for cars and bikes. Boosts the performance.

Enhance the car acceleration with quite an engien operation.

Used once and product seems to work well.

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Made no difference whatsoever..