In August 2005, fuel in Belgium averaged €1.333 for petrol

Petrol, monthly average€1.333/L
Diesel, monthly average€1.086/L
LPG, monthly average€0.436/L
Weekly bulletins held for August 20055

Monthly averages for Belgium across August 2005, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).