In April 2006, fuel in Belgium averaged €1.351 for petrol

Petrol, monthly average€1.351/L
Diesel, monthly average€1.064/L
LPG, monthly average€0.489/L
Weekly bulletins held for April 20063

Monthly averages for Belgium across April 2006, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).