@Mutt:
No, it's not an added tank aircraft. According to Airbus, the range of the A320 with full passengers and bags is 3,200NM . . According to Great Circle Mapper, RUH-CDG is 2,900NM which is well in the A320 range with the winds in mind. So far I have seen ASA/ASB/AS11 on the route. However, I have seen AS31/ASA/ASB on the RUH-FRA route.