In April 2018, fuel in Bulgaria averaged €1.063 for petrol

Petrol, monthly average€1.063/L
Diesel, monthly average€1.057/L
LPG, monthly average€0.485/L
Weekly bulletins held for April 20184

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