STPGST50400EN ST50400EN Complete Petrol Fuel System Cleanner, 400 ml

Arrived quickly from Amazon, we'll packaged. Put this in a full tank on my 2015 1.2 petrol DS3 w/103k on the clock about 2 weeks ago and so far looks good. My fuel gauge is digital and each quarter is split into 3 blocks, since I bought the car 2 1/2yrs ago I've been gauging fuel use by using the trip computer, trip 1 for each block and trip 2 for full tank, each block was going after about 28 miles, 30 at a push, so each quarter tank gave about 84ish miles, so a full tank was returning about 350 miles, my journeys are very much the same month to month, home-work-home, shopping or popping to MILs. Since I've put this in 2 weeks ago each block in the quarter of the fuel guage has been going off after 35 miles, so 105 per quarter so possibly signifying an increase of 70 miles or so for the full tank.Now in February I did have new tyres all round and a wheel alignment so the new fuel economy could be partly down to that but I have felt that the throttle response does feel much better, I've got this on subscription so planning to put this in my car and the wife's every other month and see how it goes but at first impressions it looks to be doing something positive

Great product, I was actually just about to re-order it. It helped my car so much, I have a small engine and my car didn't get much maintenance from previous owners - this product did it's job well. Great value for money, cleansed everything I could feel much more power coming out from that engine! Lasted about 4k miles. Highly recommended.

Updated review. In summary it helped low-end performance but did not improve fuel economy for same *driving style*.Do these cleaners work? This is an emotive subject but unfortunately like most people I am not trained in stripping down and rebuilding the engine in my car! So let's look at this idea about deposits another way - burning hydrocarbons makes deposits, so would you not get your home gas boiler cleaned and serviced to keep it working efficiently?I have a 2009 Kia Rio 1.4L petrol on 60k miles, the engine is a simple DOHC 16v unit with a cast iron block. I chose this product because the datasheet indicated that it is x5 more 'concentrated' than the equivalent Redex, so this was essentially the same cost versus 'cleaning power'. During the past two years I have occasionally used Redex and I am certain it has improved the engine's response and the fuel consumption, but exactly how much I don't know. The only issue I have had with this product is with dosage, the bottle label contradicts the products US website, so I used 50% bottle in 9 gallon (imp) tank. After one tankful I would say it has helped low-end performance (up to 3k rpm) but did not improve fuel economy for same *driving style*, I think the economy gain is cancelled because you inadvertently continue to use more throttle for the same rate and so use more fuel, so maybe I'll try to accelerate with less throttle and see if I get an improvement. I think next time I will try either Techron or Seafoam.At the end of the day I see this as a one-off preventative measure on a car that I put £150pcm worth of petrol into, it may be that my 10-mile commute and occasional 'Italian tune-up' are ideal in reducing the build-up of deposits.

Top ! Best fuel additive i bought in years , compared to other popular brands , it's the best of the best .

I normally fill up with BP Ultimate but on a recent 3,000+ mile road trip knew I would have to fill up with regular 95 for large parts of the trip. I decided to buy the 5-in-1 treatment to mitigate using the regular unleaded, as opposed to thinking my engine specifically needed to be cleaned. For reference my car is a 2022 BMW M135i xDrive and had 16,000 miles prior to the road trip. At around the 2,000 mile mark in my road trip I added the treatment to a tank of regular unleaded. After using the treatment I achieved the best MPG I’ve ever had out of the car, 56.7mpg. Previously my best was around the low 50s. I will now use the treatment every few thousand miles. I am genuinely impressed.

Gave a boost of about 4mpg in the the car I was driving.