Arvo Ruotsalainen of Neste Oil says that crude oil prices are up to 15 dollars per barrel from mid-February. Prices haven't been that high in a year and a half.

Indeed, prices now are at the level they were prior to the economic crisis. Meanwhile, the euro has weakened against the dollar. Crude oil prices are rising particularly now with the positive outlook for the U.S. economy.

“If the exchange rate between the U.S. and Europe continues to develop this way, petrol will cost over 1.5 euros per litre this summer,” he predicts.

Ruotsalainen says rising prices are bound to have an effect on driving habits.

”Petrol cost 1.5 euros per litre a couple years back. If prices go up much more than that, people will drive less.”