Hi,
OK OK, bound to get lots of abuse! Or not!
I swear by Shell Optimax in my Ford Mondeo [2 litre c130 bhp]; I also ONLY use Shell Diesel in my 2.2JTD Ulysse. Why? Shell, together with Texaco, are the only fuels to contain the right amount of detergents [that goes for 95 and 98 ron]. Also, the price is offset by the increased mpg [10% potentially], but that is not the issue surely.
Use supermarket fuel? Pay less now, pay for it all later when the engine goes early. And if you read Telegraph Motoring [very few of you, maybe!], no supermarket chain will guarantee their petrol [if you stick to one fuel wholly, there is a potential claim against that fuel supplier if things go pear-shaped!].
At the end of the day, each person has to make that decision for themselves.
Flak time......
Stuart