I save.
Only because my conscience makes me unhappy!
So eating all in one sitting....is never enjoyed.
I eat maybe a third.Plus something to look forward to later :)
It depends what it's a packet of and how big it is. I don't finish a packet of chips or biscuits in one sitting, unless it's one of those little snack size ones. Not by myself anyway. It's different if I'm sharing it.
Yes, I definitely can as am quite obsessed about not putting on a lot of weight, and would prefer to eat a little chocolate every day rather than a lot all at once.