Years ago when I was driving 200+ miles per day up and down the M1 I filled up alternately between supermarket (Tesco) and a Shell garage. I averaged 50 miles per tank more from the Shell garage which was the equivalent of about 2 extra gallons which was worth a lot more than the 20 -50p saved by buying the cheaper petrol.
I did hear that although they petrol is carried by the same tankers the 'cheap fuel' doesn't get the chemicals added. I'll see if I still have the report (I think I posted it here once a couple of years ago).
To be fair I think supermarket fuel has improved since then but the the price differential has decreased also.
Last edited by Sooty; 15-10-2008 at 06:23 PM.
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