(ANSA) - BELGRADE, MAY 18 - Slovenia's regulated petroleum product prices will rise at midnight, with regular petrol rising 2.6 cents to EUR 1.709 per litre and diesel rising 1.9 cents to EUR 1.753 per litre. Regulated prices, which apply only outside the motorway network, will continue to be set weekly using a methodology that takes into account price trends tracked by PLATT's European Marketscan as well as the dollar-euro exchange rate. Since March 20, fuel prices at service stations along motorways and motorways have been fully liberalised. (ANSA).