In April 2018, fuel in Croatia averaged €1.339 for petrol

Petrol, monthly average€1.339/L
Diesel, monthly average€1.270/L
LPG, monthly average€0.622/L
Weekly bulletins held for April 20184

Monthly averages for Croatia across April 2018, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).