The station went from 3000W to 25 kW. So, that's ~9 dB.
No. It won't double the coverage area. But, the City Grade now goes almost as far as the old 60 dBu did. That's certainly an improvement, I'm sure. In fact, with the new transmitter site -- a tad closer-in to Vicksburg, it will City Grade a nice chunk of the City.
So, yeah. Enjoy.
DE