BelArgUSA,
200 down the Autobahn was more than enough for me, but I've never really had a thing for speed.
My point was that the speed restriction doesn't apply in Frankfurt, but the controllers have to continuously remind the US crews of that fact as they all just stick to 250/10000, probably as a force of habit
Maui -
Basically this is your answer.
Jepp WWT United States.
"United States Federal Aviation Regulations (FAR's), ATC procedures and definitions are applicable within the Domestic Airspace, Alaska, Hawaii and Offshore Airspace Areas".
This means that the 250/10000 applies within those areas (specifically Domestic Airspace) and not in the Oceanic areas.
As BelArgUSA has shown (its also in the WWT/AIP), in most cases US Domestic Airspace ends at 12nm, and then becomes Oceanic Control Area.
This means blasting out from LAX, once you are outside domestic airspace you aren't limited by that FAR restriction.