In September 2018, fuel in Slovakia averaged €1.409 for petrol

Petrol, monthly average€1.409/L
Diesel, monthly average€1.287/L
LPG, monthly average€0.625/L
Weekly bulletins held for September 20184

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