When we stopped there in March, prices were quotes as X + 7% sales tax, i.e., not inclusive.
The price was still very good, though. And it looks like there's a shrimper fleet docked next door, so they probably sell a boatload.
Current can be a serious issue. We were able to get in OK, heading into the current, but then that made leaving a bit dicey. I was able to pivot enough, and then use enough horsepower in reverse to quickly get away and begin turning... while not being swept into the rocks just on the downstream side of their inlet for smaller boats. (We usually can't go forward as we depart docks, due to our dinghy-off-the-stern situation.)
When we were in JAX, Mandarin Holiday Marina about 14 NM south had much better prices than anyone nearby, not quite as good as New River but close.
And then Larry (I think) said they found a fueling place heading out of JAX that had equally good or better diesel prices.
-Chris