In July 2021, fuel in Belgium averaged €1.513 for petrol

Petrol, monthly average€1.513/L
Diesel, monthly average€1.503/L
LPG, monthly average€0.623/L
Weekly bulletins held for July 20214

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