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If I've never let my gas tank go empty, does it still contain traces of the gas from every fill-up it has ever had?

881 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If I've never let my gas tank go empty, does it still contain traces of the gas from every fill-up it has ever had?	881
How many people have lived in the history of the planet? And would you calculate it?	1