Originally Posted by rrgg
You might be able to do a return that way sometimes, but most stores insist that the return be made on the original card. Also, the negative mileage balance on your mastercard doesn't just go away. If you're closing the card or retiring it then fine, but otherwise your new mastercard purchases will be applied toward the negative. There's no net gain here.
Yeah, kinda thought that about the second part...
But the first part would work- the return is on the same card as the purchase...that's how the negative balance is created...then new purchases for this month are on the other card. That part is all kosher...but the holdover of the negative balance invalidates the whole idea
Cheers.