Q: Why am I losing a half of a tank of gas in 24 hours?

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I have had my fuel pump replaced twice in my car. Yesterday 12/08/2016 I had filled up my car between yesterday and today I have lost almost a half of a tank of gas. I also have a check engine light on and confirmed by 3 different mechanics that I have a bad thermostat. My am I losing a half of a tank of gas with-in a 24 hour time span?

My car has 100000 miles.
My car has an automatic transmission.

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