Since the Tesco offer created a lot of interest, I thought I would advise that Asda are offering 2p off every litre of petrol bought from their petrol stations.
Now this has nothing to do with the recent fuel contamination issues as this deal was in force well before this hit the news and is an ongoing deal.
No vouchers which you may or may not receive. No reason not to receive this discount on every purchase from Asda.
To obtain the 2p discount per litre you need as Asda credit card which you can sign up for on-line, in-store or by freefone.
Don't forget to pay off the balance in full every month else you'll be hit with high interest rates.