Go to Auchan at Val d'Europe before going to Bussy - Easy and cheaper than the Total at Bussy, the Casino at Ferrières or the Esso as you are leaving the DLP car park.
If you are diesel it's 1.369/1.530/1.408/1.439 at the stations listed above
Shall go to Val d'Europe then! Yes we're diesel, planning to fill up whilst over there! Is Vd'E far from Bussy StG? I'm just thinking it'll be quite late when we leave but we have spare time the following morning before driving to Calais.
No when you leave DLP don't take the A4 straight away but go to Val d'Europe fill up and then do a tour round the roundabout and follow the signs for the A4 and you'll come to the turn off for Bussy.
Val d'Europe is one or two exits away from Bussy on the A4 or if you wanted to you could drive on the back roads