Robbo. Just driven back from spain. no problems getting fuel on sunday's most towns have major fuel companys, enjoy the cervaza.
what part are you going to?
Doing a circuit on my motorbike, Bilbao - Salamanca - Lisbon - Gibralter / North Africa - Barcelona - Pyrenees , Cherbourg . And get about 150 miles on a tank , so dont fancy the walk with jerry can type thing.