Hmm.. IMO you might be confusing correlation and causation here. You think the geopolitical relationship between us and OPEC countries would be different if on

Hmm.. IMO you might be confusing correlation and causation here. You think the geopolitical relationship between us and OPEC countries would be different if only we paid in Euros? What will move the needle on this is simply not buying their oil. And that's precisicely what's happening. Say what you want about fracking, I'd rather pull petroleum out of shale than buy it from Opec.