I'm a heavy user of car rentals in Europe with my US cards (previously CSP, now CSR), and this is the second time in one year I ran into DCC issues. Once it was Europcar in MUC who tried to DCC me at the counter and I caught it instantly, and now this case in Dublin. Avis, Sixt, Hertz and Europcar are usually no issue at all in Europe in over 30 rentals in the same time frame.