I'm not trying to answer my own question -- but, a friend was just down last week and she ordered the vouchers at Tusker House and then ordered a Cole Slaw with the DDE card and she actually got the 20 percent discount on her entire purchase. Hmmmm..... Sounds like it is hit or miss then.
I think early this year pretty much the same happened to someone else and they posted here. I don't think they even meant to get the discount on the vouchers. But they bought food and vouchers and were given the DDE discount on the entire purchase.
I suppose it would have to be rung separate.
And I am sure the official answer is No.
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