In December 2017, fuel in Luxembourg averaged €1.180 for petrol

Petrol, monthly average€1.180/L
Diesel, monthly average€1.043/L
LPG, monthly average€0.541/L
Weekly bulletins held for December 20173

Monthly averages for Luxembourg across December 2017, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).