In April 2005, fuel in Belgium averaged €1.204 for petrol

Petrol, monthly average€1.204/L
Diesel, monthly average€0.967/L
LPG, monthly average€0.401/L
Weekly bulletins held for April 20054

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