Indeed, not only some of the largest countries, but the bulk of the PPP-adjusted GDP of "Europe" uses the Euro as a currency, so this point is not even pedantic, it's factually incorrect. If Wikipedia's facts are straight, the Eurozone member states total to nearly 11e12 PPP-adjusted international dollars, while all states of Europe (including huge economies outside the EU, like Russia) have a total PPP-adjusted GDP of 20e12. QED: most of Europe has the Euro as a common currency.

http://en.wikipedia.org/wiki/List_of_sovereign_states_in_Eur... http://en.wikipedia.org/wiki/Eurozone#Member_states