“You may notice a difference in available space statistics between Disk Utility, Finder, and Get Info inspectors. This is expected and can be safely ignored. The Finder displays the available space on the disk without accounting for the local snapshots, because local snapshots will surrender their disk space if needed."
Thank you! So it wasn't Boot Camp after all. Unfortunately, it appears the only way to turn this feature off is to turn Time Machine off. So my "true" hard drive space remaining is 240GB but my available space if I need it is 302GB. Good to know.
I also heard it's best to keep at least 40% of your hard drive free to ensure your computer does not slow down. Any truth to this?
The available disk space reported in finder is totally wrong.
Even if it accounts for the local snapshots. In my macbook air it shows 120 Available in finder which is just 1GB less than my SSD capacity.