Yes, they can! If the user is redeeming at a Shell Coles Express, this offer is valid with other stackable offers from Coles Express including Coles Supermarket shopper dockets and “spend $20 in store to receive 10 cents per litre fuel discount” – subject to their terms and conditions, please refer to https://www.coles.com.au/coles-express/terms-and-conditions
EXCEPTIONS: This offer excludes any other offer offered to you in whole or part by Viva Energy. If you present any other Viva Energy funded fuel discount offer for redemption from any other party e.g. flybuys, Shell Racing Team app (in addition to the fuel discount offer from G’day Parks), only the highest cents per litre fuel discount barcode will be redeemable. If all the Viva Energy funded fuel discount offers have the same cents per litre discount value, then only the first fuel discount offer presented will be redeemed.