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A good way to personally track petrol prices is to buy by-the-litre (or gallon, for you imperialists).
For example, whenever I buy fuel I always get 30 litres. I know that at my local petrol station this costs £26.68. If I'm buying elsewhere, or if my local puts their prices up I notice the difference immediately.
If you go along and buy, say, £20 worth or just fill the tank you very rarely notice how much fuel you actually bought. You wouldn't take that attitude with any other product, so why should you be so flippant with your fuel purchase?
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