Over about 2,000 miles of mainly commuting in three months, my average fuel consumption using the Redex fuel system cleaners was 31.1mpg. My driving circumstances in that time have been a pretty representative example of my usual activities, so superficially it looks like a 1mpg improvement since using Redex.

As I’ve made clear previously, this isn’t a laboratory test in controlled conditions but rather a real-world trial that gives a decent indication of what any driver can expect in everyday life. Yes, we will. But, to be honest, we’ll probably be misers and drop down to using it every other fill-up (which will make it cost just 2.5p per litre of diesel) and see if we notice the C-Max starting to use a bit more fuel, or be less happy when cold. Please note though, Redex has been safe-tested at 4 times the recommended dose, so please don’t exceed this. What is the Mix Ratio for Redex? When we did an interim report on the Redex test last month, we said that two out of the three regular users of the car thought it was running smoother, although one couldn’t notice any difference. The principle with the fuel system cleaner additives is that a clean fuel system will perform more efficiently than a clogged fuel system, much like your heart being able to pump blood more freely through clear arteries than clogged ones. Clogged arteries also mean your heart has to work harder and is at greater risk of heart damage, and your engine is no different. Over time, clogged fuel injectors can potentially lead to expensive engine damage.

Has economy improved?

Each Redex bottle clearly shows how many shots it contains on the front label, with easy guide ‘shot’ marking on the side. Adding more than one shot of Redex won’t do any harm to your car and can give you a more intensive clean, so don’t worry if your pouring isn’t exact.

It’s also a really easy to use product, just putting a single bottle of Redex cleaner in to the tank at each full-up, which soon becomes second nature. What have we found in the last few months of using Redex? Also, if your tank is larger or smaller than 50 litres you can still use the recommended dosage with same level of performance being achieved. We had no hesitation in trying this out, especially as just about everyone at Cars UK Towers has used Redex at one time or another, and were confident it was safe to use. I’ve just finished a three-month trial of Redex fuel system additives in my Mazda MX-5 to see if I could feel any increase in my car’s performance or measure any significant difference in its fuel economy. Our petrol and diesel fuel system cleaners are supplied in 250ml and 500ml sizes. The smaller 250ml version contains two doses / shots and the 500ml provides 4 shots.

As I outlined in previous reports, the type of fuel additive that I’ve been using is a fuel system cleaner rather than an octanebooster. The goal isn’t to turn regular unleaded into premium unleaded by increasing the car’s octane number, but simplyto give all the tiny pipes and injectors a thorough clean so they can do their thing without being clogged up.