I put it in my fsi and took a long trip, burned the whole tank, didn't notice any difference like with others.. always with 100 octane gasoline

Leaving from northern Greece, the car adjusted only for 100 octane fuel, I filled it up at a gas station (65 liters tank). After about a quarter on the highway, we stopped at SEA for coffee and food, etc. The car seemed to be working reluctantly and I had a bottle in the trunk, I put it in and after a while we started again. Immediately, the car was running much smoother and had a more responsive acceleration. I haven't tried any other additive to compare it, but if it works like this with more liters than recommended, then I really want to try it on a track with the recommended amount. 6-cylinder turbo engine

Because I have read various reviews, I have to say the following.
On the octane booster/cleaner/additive, it states how many liters you should use... yes, I had concerns and was afraid to use it... I added 200 ml of octane booster to a 40-liter tank... with 95 octane gasoline, I noticed a noticeable difference. Fuel consumption decreased.

In golf v 1.6 FSI.

I do not use such products and I simply tried this specific octane booster out of curiosity only.

I go to the gas station for refueling... The fuel level was 2 lines above the red, I add the entire quantity of the booster and then I put 98 SHELL until the indicator reached 2 lines before full.

At first, I did not notice any difference, but the next day I saw an improvement.
The car had better response to the gas, smoother idle with less noise, and these became more noticeable on a trip I took on the highway. The differences before and after were very small. I cannot know if this translates into better performance in terms of time or if it gives more mileage.

So my impressions were positive, I saw a difference in my own car... but whether it is worth adding this additive of approximately 8.5 euros every fill-up or every two fill-ups, I do not know... everyone judges that for themselves.

Personally, I will use it again on a trip.

You add regular unleaded and the octane plus, and you are sure, the 100 octane from the gas station may not even be 100 octane!!!!

The difference in acceleration is noticeable, I don't know if it works with the brakes from the first use, nor did I calculate if I did more kilometers, but I definitely noticed a difference in the car's performance and acceleration!

I used it during a trip from Athens to Thessaloniki, and indeed the car showed willingness to accelerate despite being quite loaded. I was quite satisfied and will use it more often.

Very good! The consumption decreased, the car (Passat 1.6 FSI) had better performance and the rattling stopped!!