I have the impression that the engine was running better as long as the mixture of gasoline and injector cleaner (Flamingo) was present.
Nevertheless, only if someone removed the injectors... checked the injection and then, after using the cleaner (1-2 or 3 consecutive uses with this particular product), checked the injection again so that the results would be visible....
Otherwise... if someone manages to drive in a specific way and under the same conditions (road slope, tire pressure, weather conditions, same weight in the car e.g. with the same number of passengers)... thus detecting a noticeable reduction in fuel consumption or an increase in engine power (torque).

On an old and for years unmaintained Hyundai Getz from 2003, a bottle of Flamingo Gasoline Cleaner Additive 250ml combined with Flamingo Octane Booster Gasoline Additive 250ml, BEFORE filling up with 100-octane gasoline, managed to turn off the permanently lit Check Engine light after 1 day and gave the first signs of revival to the choked little Getz.
On the 2nd fill-up, again in the same way and combination, there was incredible response on the pedal and a combination of nerve and torque that the car had never seen before!

P.S. I also got the rest of the Flamingo products [Coolant Additive, Oil Treatment, and Oil Smoke Reducer] and I have truly seen excellent results! VFM and 5* on everything!

I have a 2004 Ford Fiesta 1400cc with over 200,000km, running on LPG for the last 5 years, and I often use this additive and have no issues. Overall, I am satisfied with this company's products, they are cheap and do the job. Also, with every oil change, I use their oil enhancers, like smoke stop, or sometimes the oil treatment, and never had a problem! For sure, they work! The red carburettor cleaner is also very good. You rev the car to 4000 rpm and spray it on the throttle, and it cleans the throttle, injectors, pistons without turning off the engine. Every time I use the whole spray and everything gets cleaned immediately, it comes out the exhaust. Just as you spray, the revs drop, so you let it rev up again and spray again...

It does a very good job. I tried it on both a motorcycle and a car, I saw differences in performance. On the motorcycle I saw a huge difference, maybe because it is older or maybe it works better on small engines, I'm not sure. In any case, it is very cheap and does the job so I recommend it to everyone.

I used it on a Smart 451 Mhd along with the booster, €5 for both, and I can say that for that price they do a very good job. I noticed a slight difference in consumption and the engine has more torque than before

I put it in the tank of a Citroen Saxo 2002 and it stopped the shaking it had at idle (low RPM).

I got it in combination with the enhancer in a Golf 5. I saw a huge difference in the engine giving me torque at low RPMs which was struggling especially on inclines, what can I say. Give it a try

Guys, the products are fantastic just like the octane booster. Don't expect miracles with just one use, especially when they give you the famous unsuitable five-contaminant full adulteration and water Greek gasoline!!!!!!! And we expect miracles with just one use!!!!! For perfect results, the combination of both products for at least five fill-ups of clean gasoline from a certified station is necessary to clean the entire system, and then express your opinion objectively!!!!

A light bulb for the lambda sensor in my 2006 Fiesta went out, in combination with the octane booster from the same company. And in the 2010 Yaris, I noticed a decrease in fuel consumption

For the money it does the job. Don't expect crazy cleaning if there is a problem but it is a good product at an economical price

In my case, it didn't do anything. I decided to try it because of the very good reviews, but if someone expects that with about 2€ it will clean the injectors, etc., what can I say? I don't know.

I filled it up with regular unleaded fuel and drove 380km, I didn't see any problem. However, the check engine light continued to stay on.

Especially in the kia picanto that I tried along with the fuel additive from the same company (half and half), I saw immediate results. Better gas response, cleaner and better performance in the car. I am very satisfied.

I used it together with the corresponding amplifier from the same company! The difference was immediate and intense, I must say! I feel like the car listens or became much lighter on the gas, and there is even a noticeable difference in fuel economy. This is the second time I have used them... very satisfied!

In Peugeot 307 1.6 with the air conditioning on, it would get confused when I started on an uphill... As soon as I used it, it works perfectly without any confusion!!!

It is effective and very cheap. Good for regular use but it wouldn't be my choice if there was a lot of time to clean the spraying system and/or there is a serious problem, as it seemed much milder than others I had tried.

I think it is the best Value For Money option out there.. I noticed various improvements in the car and if I'm not mistaken, the fuel consumption has also decreased.. corolla e11

I understood the difference after 200 kilometers.
Even the sound of the engine changed.
I believe it does the job, at least it did for me. Worth it!

I bought it after reading the comments as a value-for-money product without having any issues, just for maintenance. After consuming 20 liters with the additive, sudden blockages started and the check engine light also came on for low-quality fuel. I went for a trim and came out with a buzz cut in two words.

In my case, only damage occurred after 300km, the "checking emissions" light came on, and the result was that I had to pay 400€ for the 4 catalytic converters + lambda sensor. I should note that I never had any problems before.

Although it is the cheapest of its kind, it offers perfect results. However, you need to consume almost the entire tank to notice the change in your car's acceleration.

In Ford Focus Ghia 1.600 cc with 265,000 km, model 2001, it immediately fixed the idle tremor. It should be noted that the car has been running on LPG for 9 years, so it doesn't consume much gasoline. However, as soon as it consumed only 1/4 of the gasoline tank, the occasional tremor disappeared. The low price didn't convince me to use it, but in the end, I realized that it does exactly what it promises.

Update 19/4/22: I also had an issue with the check engine. The LPG workshop told me that the oxygen sensor needs to be replaced. Reading a similar comment where someone added a gasoline additive and the engine light went off, I was ready to add the gasoline additive as well. Finally, yesterday, without adding anything else, the engine light went off!! After a few thousand kilometers, I will definitely use it again to keep the engine in good condition!

Periodically, I use injection cleaners (trying various brands) for maintenance without encountering any problems. My car is 17 years old with 260,000 kilometers. Occasionally, the check engine light comes on due to low-quality fuel, as there is no damage indicated by the engine. This time, when it came on, it went off after adding the cleaner and driving a few kilometers. It seems to do the job and is worth it. The price is very good compared to the competition.

Having tried many similar products (redex, etc.), I believe it is the best value for money. In my Audi A4 TQ 1999 model, the pre-ignition/clattering noise stopped and there is noticeably less vibration at low RPMs and idle. Due to its low price, I bought it again and will use it every 5-7 thousand kilometers.

Difficult to evaluate its effectiveness. It was used together with the company's gasoline additive and the engine knocking stopped. Therefore, they did some work together. The problem appeared due to unsuitable gasoline quality, not due to mechanical damage.

I used it on a golf fsi 1.4 and on a trip with 4 people and luggage the car was flying. What can I say? I don't know what they put in it, but it worked for me.

I filled it up with a full tank of gasoline from "outside" and everything is fine. In a previous case of gasoline, some lights came on that scared me... It's cheap and does what it says...