In March 2011, fuel in Belgium averaged €1.514 for petrol

Petrol, monthly average€1.514/L
Diesel, monthly average€1.373/L
LPG, monthly average€0.686/L
Weekly bulletins held for March 20114

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