I have had tow awful poor fuel experiences at supermarkets ,they are cheap for a reason only use use BP Ultimate range as they are better , particularly for the engine and performance , yes 5p a litre more however there is a long term gain in repair costs in my view , for example one of my fuel injectors went straight after filling up at a Tesco p 300 quid gone , got 4 on the car cleaner fuel cleaner injectors . yes it was 5p cheaper than the BP on Nantgarw however my car is now much smoother in its running when using BP fuel .

The after option is cheap fuel plus additives however that is costly and almost evens out the extra you paying for BP fuel

As MPG I have changed my driving behaviours drastically ie less speed , use cruise control , less brakingh , lighten the load in the car boot , slow down gradually rather speed and brake up too lights , junction ,easily getting 10 to 14 mpg benefit .

Just my experience others may have different views ,drive slow be safe , save money