The charts list the empty weight of the P-47D-25 at 10,250lbs. The "Combat Condition" weight is at 13,580lbs.
The 14,600lb figure most often seen represents 1,020lbs over and above "Combat Condition" weight which may have been the additional weight of two 500lb bombs. (I'm just guessing)
At any rate, the 14,600lb figure appears to be incorrect if understood to be with full internal fuel and normal ammunition load.