In December 2015, fuel in Belgium averaged €1.211 for petrol

Petrol, monthly average€1.211/L
Diesel, monthly average€1.041/L
LPG, monthly average€0.456/L
Weekly bulletins held for December 20152

Monthly averages for Belgium across December 2015, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).