If I've never let my car run out of gas, how much gas from the first time I filled up is still in the tank today?

I need to know.

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Well one thing I know is you shouldn't run it low on gas, then fill it up. The fuel pump is on the gas tank and as you drive it alot low on fuel the fuel pump gets warm,then fill it up,the fuel is cool. It will make your fuel pump needing replacement, shortening it's life