Ok.
So you are strictly plotting based on scoopable stars then. Well I don't want to limit myself to that, and after the that happened to me today, every ship I fly, is going to use a size 6 slot for the extra 64t tank.
Today I was short on a guardian material(I needed 3 more tech components), but I was just south of my usual exit from the bubble spot. I figured no point in going to my station, just leave the bubble from here(From my station, I usually pass through a cluster of 6 brown dwarf systems, not a big deal, I have the bigger tank afterall), but this rout took me through 20 brown dwarf systems in a row. When I have like 3 jumps of fuel left, I start to get worried big time. I open the Galaxy map, milter everything but foam, it says there's only one planet near me. I jump there, the dumb navcom lied, it was yet another brown dwarf.
Now I'm predict there a 90% chance, I'll have to call fuel rats(of they'll be ed at me, when they see what they have to travel through), now I suspect I can make 2 jumps without being completely empty(just not enough to jump), so I attempt to give it one more try. I open the galaxy map, the settings are all correct, there appears to be a scoopable star 2 jumps away. I switch to the realistic map for color verifications, it seems good. I make my 2 jumps, and omfg I never felt so relieved to see a ball of burning death before
Um yea, I'll take the extra fuel tyvm lol