In May 2008, fuel in Belgium averaged €1.531 for petrol

Petrol, monthly average€1.531/L
Diesel, monthly average€1.361/L
LPG, monthly average€0.606/L
Weekly bulletins held for May 20084

Monthly averages for Belgium across May 2008, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).