In January 2018, fuel in Luxembourg averaged €1.197 for petrol

Petrol, monthly average€1.197/L
Diesel, monthly average€1.058/L
LPG, monthly average€0.524/L
Weekly bulletins held for January 20185

Monthly averages for Luxembourg across January 2018, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).