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2006 Buick Regal bad gas mileage

my gas has gotten really bad milage

Is your check engine light on? If yes, get the codes read, and post them here - in the form P0xxx

Does the engine warm up quickly - does the temp gauge get to the middle quickly? If not, you likely need a new thermostat.

Do you brakes feel like they are dragging? Get those checked, too.