A utility mount (or an optional internal). One that draws on a special fuel type. If a utility mount, requires a specialized fuel tank for the fuel which can be crafted on the fly or purchased at stations). If an optional internal, would have a built in tank for use with the functionality.
Now...
I want this video to get media because nobody knows how to use the premium Fsd Injection correctly. Sorry there is no commentary because I wanted my video to be Raw Footage of a 232 ly jump! Enjoy! :)
Source: https://www.youtube.com/watch?v=IxWWjXOfORI
If not previously suggested, a small addition to the Navigation Panel would reduce the need for accessing the Galactic Map for route information.
Under the Destination: Total lightyears left to jump.
Under the Waypoint: Total lightyears to waypoint. - May appear redundant, but removes the need...