Avantage:
You get 2 bob credited to your card per the number of liters you fueles on Mondays,Wednesdays,Thursdays and Satos;Then 2 bob on Teusdays and Fridays and 3 bob on Sundays.
You can plan to fuel with a discount of 5 bob if you are clever like me.
Disadvantage:
You spend more time in the fueling station than the guy using cash.You have to get out of car,pin PIN into the damn remote reader,be patient for the slow attendants and sign some funny receipts.You spend like 7 times in time.
Portfolio: Sold
You know you've made it when you get a parking space for your yatcht.