The continuing weakness of the dollar has softened the higher oil prices and with winter over, diesel refinery prices have dropped back below unleaded prices.
By my calculations USA refinery prices are running at 58c for diesel & 60c for unleaded. European prices should theorectically be about 3c higher due to higher brent oil prices however this calculates to a forecourt price of €1.44 for diesel & €1.59 for unleaded.
I suspect some cross subsidisation of pricing or european refineries charging more for diesel and less for unleaded due to the higher motoring demand for diesle over here. So best guess is diesel will remain steady or drop back just a little and unleaded to increase to €1.55+