Petrol is currently around ?1.39 per lt, which is about ?1.02. However, if you're travelling via the Port Tunnel and M1 you'll only meet 3 petrol stations. 1st is just as you leave the docks, petrol here is always a little dearer (captive audience!!) 2nd is the M1 services at Lusk, just North of Dublin Airport and finally M1 services at Castlebellingham, just north of the M1 toll at Drogheda. As in the UK, services tend to charge a bit more for fuel. They will take card, but don't usually accept ? sterling nor will the toll, so be prepared.