2000 V6 ford mustang bad gas mileage?

So my Ford Mustang its eating away gas kinda fast for my understanding, i do around 6.5 miles to work and the same back to the house but for some reason its going kind of fast. To put it into perspective i filled up my tank last night and it has gone through a quarter of the tank in less than a day, my calculations is that it'll be by half of tank tomorrow. So for those car experts out there can you give me a suggestion about what could the problem be?

Could have bad gauge, bad sending unit. If you want to know what your mileage is do it the old fashioned way. Write down your mileage when you fill it up. When you fill it up again, divide miles by gallons, gives you mileage. Odds are your fuel float in your tank messed up

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