Simon , I too experince the same issue with supermarket fuel, infact my wife can tell as soon as she drives to work on a monday if I have ever filled with supermarket fuel over the weekend. the most remarked difference is the fuel consumption and general lack of that sharp response.

Someone will be along in a minuet to tell you all fuel is the same and I'm talking out the back of my head, but for me we now stick to a well branded fuel and whilst its dearer I achieve more miles per tank and the car is more crisp and responsive.

In fact I can go as far as to say one of our cars is a petrol which has the most adictive crackle from the exhaust it sounds great but when we fill up at the supermarket it loses it crackle for the duration of the tank, so anyone that wishes to challenge me on that one is welcome as its fact, and the cars sparkle dissapears.

One of our cars is not so noticeable for loss of performance or economey with supermarket fuel except if i use it for towing ! then its hopeless on supermarket fuel so no longer use the stuff!

Hi Dutchie, yeah it does rather. I have to say it does have a lovley crackle to it though which is so addictive its just great.