In January 2021, fuel in Belgium averaged €1.314 for petrol

Petrol, monthly average€1.314/L
Diesel, monthly average€1.351/L
LPG, monthly average€0.567/L
Weekly bulletins held for January 20213

Monthly averages for Belgium across January 2021, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).