In December 2011, fuel in Belgium averaged €1.540 for petrol

Petrol, monthly average€1.540/L
Diesel, monthly average€1.427/L
LPG, monthly average€0.664/L
Weekly bulletins held for December 20113

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