In April 2011, fuel in Belgium averaged €1.625 for petrol

Petrol, monthly average€1.625/L
Diesel, monthly average€1.422/L
LPG, monthly average€0.692/L
Weekly bulletins held for April 20113

Monthly averages for Belgium across April 2011, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).