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I am unsure if the following things have been posted before.
You can get free Supercharge Sauce on a burger just by asking for it.
The big hack is to go 15 minutes ahead of closing. Tell them that you have $20 or so (be reasonable, don't be a dick.) and ask them for 'What they have left'.
They will give you the remainder of their stock as otherwise this will be binned.
You're welcome!
Even more amazing, go 16 minutes ahead of closing and say you have $19. That way you save $1 and don't have to wait a minute more. Also that 15 minute guy gets nothing!