In May 2019, fuel in Slovakia averaged €1.428 for petrol

Petrol, monthly average€1.428/L
Diesel, monthly average€1.277/L
LPG, monthly average€0.612/L
Weekly bulletins held for May 20194

Monthly averages for Slovakia across May 2019, from the stored EU Weekly Oil Bulletin monthly history (European Commission, CC BY 4.0).