TBH, cheaper or not, Id rather fill up with Shell fuel over BP....
I used to be like that haha, usually Shell is cheapest or thereabouts anyway, but my engine (like a lot of engines out there, Google is your friend) runs like a bag of nails on the new Fuelsave diesel, so I don't really have the option of Shell anymore (unless I want to put in V-Power which has no real benefit lol).
So I just go to Esso now. I don't really care about prices, it always nice to save a few pence, and admittadly if everywhere were say 128.9p and I saw a garage charging 123.9p, id probably get a tank and save the 5p per litre, but generally, ill just pay whatever they are charging.
Its only money at the end of the day. A lot of the people I know who moan about the prices, are quite happy to go and spend £100+ a weekend clubbing, or £20+ down the Pub
a few nights a week, but when it comes to fuel, they will have a good hours rant about it. When it hits £2.00 per litre, ill probably change my mind lol.
Taxes have to come from somewhere, and unfortunately drivers are the easiest to hit. Drive less and walk more if its biting. For commuters, if you can take public transport within the local area, someone I know worked it out recently, with current fuel pricing, VED (unless you have a hairdryer of course), insurance costs and maintenance costs, it works out far cheaper to get a season pass such as a Solo (if they still do them) or a Trio than to commute by car. But of course, thats if its convenient.