Slovenia is a short country to cross — barely two hours from the Austrian border to Croatia — which makes it an easy place to get the fuel stop wrong. This guide covers the A2/A1 corridor from the Karawanks tunnel through Ljubljana to Koper or the Obrežje crossing.
Just after the tunnel, Jesenice, Radovljica and Kranj all have stations a few minutes off the motorway at regulated prices. Around Ljubljana the ring road has plenty of exits with town stations nearby, so you never need to rely on a service area.
For the coast and Istria, Postojna, Divača and Koper are the practical stops. If you are continuing to Zagreb and Dalmatia, Novo mesto or Brežice is the last sensible chance before the Obrežje border, where queues can be long in summer and Croatian prices are often higher.
A simple rule: leave Slovenia with a full tank and you will usually reach your destination in Croatia without another stop.
Slovenian motorways require an electronic vignette linked to your number plate — buy it before you enter, online or at the last station across the border. Croatia still uses a ticket-based toll system with barriers, where cards are accepted. Two different systems on one trip, so plan for both.
The live map highlights the cheapest stations along the corridor and marks which are off the motorway, so you can pick your exit in advance instead of paying service-area prices out of convenience.