I tried two consecutive tankfuls in my HDI & found no difference to normal Shell which I use mostly.The bog standard diesel has cleaning agents.Supermarket fuel does not have the same quality additives.
I will only use supermarket fuel very occasionally.
Strawberry flavoured windows
I fill up with whatever is available at the best price within a reasonable range. So that means Esso in Bristol and Asda in Gloucester. Plus biodiesel whenever I can get it. Now my car is a 1.9D and I have never noticed any difference. My previous car was a diesel Seat Alhambra and again never noticed any difference.
This debate has been done loads of times all over the interwibble (just google for supermarket fuel vs branded) and the results are completely inconclusive.
Security system should not fail safe!
Security system should fail dangerous!