In December 2018, fuel in Slovakia averaged €1.257 for petrol

Petrol, monthly average€1.257/L
Diesel, monthly average€1.220/L
LPG, monthly average€0.594/L
Weekly bulletins held for December 20183

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