This is a PAssion cardmember benefit. 14% is inclusive of the station discount.
Promotion is only valid every Thursday, from 4 July 2013 to 26 December 2013 and not valid with any other offer.
Now that flashing PAssion card allows you to enjoy 14% discount, you can maximise your petrol spending further by charging to a credit card of your choice to earn the rebates or points.
Just a side note, for spending of $50 nett in a single transaction (a $60 gross petrol spending should safely cross the $50 nett mark), credit cards like Citibank Dividend card gives an additional 5% rebates for spending on petrol.