In May 2010, fuel in Belgium averaged €1.411 for petrol

Petrol, monthly average€1.411/L
Diesel, monthly average€1.134/L
LPG, monthly average€0.545/L
Weekly bulletins held for May 20105

Monthly averages for Belgium across May 2010, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).