I post on pumps.ie and also provide forward price estimates for petrol, diesel & home heat.
I've been doing it for about a year (weird hobby of mine) and I've been rather accurate. Despite what people perceive, it quite true that rises in world prices take about 2 weeks to follow through to the pumps, both increase & decreases.
Also due to the minute margins in petrol retails (2 -3 c for many garages) the prices will change very regularly as the refined price changes on a daily basis.
To give a quick example, current cost of petrol is 38c / litre delivered to port, add in 50.79c duty and approx 11c distributor & retailer costs and then add 21.5% vat. this equates to approx. €1.22
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