On website is the list of retail outlets accepting Touch'n Go - https://www.touchngo.com.my/CMS/Pers...Usage/Transit/ However, not clear how up to the date the list is. But if Tesco accepts the card as a payment method, that's would be your way to go and spend it there. Also if you plan to take KLIA Express back to the airport, you can use it for payment as well.

If you know any locals you can offer to give them the card with exchange of cash, plus some discount, like RM20.