In March 2020, fuel in Luxembourg averaged €0.925 for petrol

Petrol, monthly average€0.925/L
Diesel, monthly average€0.923/L
LPG, monthly average€0.420/L
Weekly bulletins held for March 20205

Monthly averages for Luxembourg across March 2020, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).