How close a match are the new tires to the original? Revs per mile and weight? Certainly, you're paying some penalty in mileage there, but it sounds like a lot more stuff going on.
Have you checked for a dragging emergency brake, or overheated rotors after a drive confirming the friction brakes are working overtime, perhaps dragging?
At 12 amps, it should be drawing more than that . . . even in Alabama.
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