Tough questions. I think about them too much. Is storing hoarding? We have 700 million barrels in our SPR. Is that hoarding? I think hoarding might be(with oil at least in many cases)just stored oil that someone else would rather you be selling.

The food in my neighbor's refrigerator is just that, in fact I  don't know what's in it, nor have I ever even seen the refrigerator. But if I'm starving, hey, now my neighbor is hoarding.

The Saudis or the "speculators" weren't doing anything wrong until gas hit the still ridiculously low price of $2.90/gallon. Now they are hoarding. I think this might just be another case of Americans needing something or someone to point a finger at.

We have 700 million barrels in our SPR. Is that hoarding?

That's a big YES in my book.

The us still manages around 7mmb/d, so what is in the spr is 100 days of us production. how is it hoarding to pump from one hole in the ground to another one? Is it hoarding to not produce oil in alaska's preserve?
The us is accused of insufficient savings. the spr is one of the few places where the us is actually storing something for future use that is likely to have value at that time.
The American Heritage Dictionary defines hoard this way:

A hidden fund or supply stored for future use; a cache.  Or To keep hidden or private.

It's not really hidden, so you could argue it's not a hoard.  OTOH, it certainly is "private," in that not just anyone can use it.

Personally, I don't see anything wrong with hoarding.  As long as it's not carried to extremes, anyway.  

everone hoards.  the spr is a hoard on a large scale.  keeping the car above 1/2 tank as "preparation" is hording on a small scale.  iirc, one of the factors in the 70's shortages was that everyone tried to get their cars up to F (full) at once.  200 million cars, and say 10 gallons per car, that's a sudden (fear fueled) 2 billion gallon blip in quantity demanded.

i think politicos try to argue against that kind of small sacle hoarding, and set as "bad" buying extra containers & etc.

storing is hoarding in any resource constrained environment.
Profiting is to Gouging
as
Storing is to Hoarding
Storage is just that, and the term "hoarding" is someone's negative judgement on the motivation for that storage.  I can see lots of reasons to store, which could be good or bad, depending on whether your the one doing the storing or not.
I think an argument could be made that they are hoarding, and we are not.

Hoarding has a connotation of secrecy.  Hoards are hidden, stores are not.  Everyone knows about our SPR, but no one knows exactly how much the Saudis have.  

I thought they had exactly 261 Billion barrels. That number never even changes. How great is that!?
If I have gun and I'm hungry, and you want maintain any control over your your supplies, perhaps you might want to keep quiet about it.