"According to the CIA fact book the GDP of the two blocks/countries are even at 11 trillions. If you don't adjust for PPP the EU comes out ahead."
US GDP is currently at about $12 trillion USD.
The EU-25 GDP is currently a bit larger on the basis of the overvalued euro. Regardless, you'd be hard pressed to find anyone who believes that the U.S. won't outgrow the EU (even EU-30) just as it did the last time the EU's aggregate GDP was larger than America's.
Regardless, it's really foolish to ever compare the EU's "GDP" to that of America. It's simply not a single economic entity. If the comparison is taken as valid, then you have to insert enough wiggle room that you should more accurately compare NAFTA and the EU.
In a way true - but the sngle currency does bring it along in that direction.