What's the best jump drive to put on a Nephilim?

[Hobson]

Considering I'm going to put 2 docking modules on it and it has only 1190 cargo available because of the MKVIII CAU, should I even bother with equipping one? Will it be a pain to keep buying fuel after every single or second jump? It certainly has enough power for any of them.

Also, does it use more fuel if other players have ships docked on your BS?

Lastly, according to the wiki the Nephilim can take 3 of them. Does it reduce the charge time at at increased cost of fuel or what's the point of having 3 - do you need an extra module for each docked ship or something?