Not sure that this is the correct area of the Forum to post this but can anyone explain to me why there is such a big differential between the price of Diesel and Petrol, when just over a year ago there was only a difference of a penny or two. I had put it down to the massive increases that we saw in the cost of crude oil but as that has now dropped well below the price when we had the 1p difference, it sort of rules that theory out??