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Yes, driving the car hard WILL affect your gas mileage adversely.
Additionally, you have given no indication of what your actual gas mileage is. Since you don't run your tank empty, "300 miles per tank" is a useless measure. You also have not told us which engine your car has, which will make a difference in your mileage.
All Tauruses have four doors. There is a sedan and a wagon. The wagon is heavier and will further reduce your mileage.
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