In April 2021, fuel in Belgium averaged €1.421 for petrol

Petrol, monthly average€1.421/L
Diesel, monthly average€1.420/L
LPG, monthly average€0.549/L
Weekly bulletins held for April 20213

Monthly averages for Belgium across April 2021, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).