In August 2011, fuel in Belgium averaged €1.539 for petrol

Petrol, monthly average€1.539/L
Diesel, monthly average€1.365/L
LPG, monthly average€0.643/L
Weekly bulletins held for August 20114

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