Additionally, when in the inventory the tooltip says energy consumption is 2.4MW, while on the ground it says 6.2MW.
See images:
![Image](https://forums.factorio.com/images/ext/3e15e426212711c8ea1f151dd09705e0.png)
![Image](https://forums.factorio.com/images/ext/f40d0e46b3d338c6c149c4dd928cf77b.png)
Edit: Come to think of it, in my other game the consumption was still different, so I think it may have to do with the shooting speed. Still - there is no reason the tooltips won't display the same info (whichever is deemed more accurate).