Didn't I just get a "double"?
I used Dividend Miles mall to link to go to restaurant.com, then purchased the cheapest gift certificate they had ($10) for a local restaurant that is on the Dividend Miles Dining program. With the current code "NEW", it only cost me $2.50 (but that's 27 miles at 11 miles/dollar).
I have to spend a minimum of $20 at this little burger/sports bar joint (so I'm looking at a minimum of $12.50 out of pocket + tip), but I'll use my linked Dividend Miles Dining credit card to pay for the difference between the gift cert and minimum spend + the tip.
Unless I'm missing something, I think that I just "doubled into the left-center field gap" - 1 hit for Dividend Miles dining (once I go) + 1 hit for Dividend Miles mall purchase, right?