In reply to snoop6060:
Avis were ok in Barcelona itself. They managed to organise us a week one way from Barcelona City to Girona airport.
Its a long time ago, I can’t remember the details about fuel and price. No tricks as far as I remember and the staff at Girona dropped us off right at departures with all our suitcases, they wouldn’t let us get a bus or walk which was kind of them.