I'd just like to add to that bit about keeping weight down with a smaller tank. This of course won't be an issue with small ships like Corba and Haulers, but it makes a difference in bigger ships like Asps and Pythons...
I did a quick test recently, and outfitted my Asp with a 32 ton tank. I plotted a course using my BBRA* first leg. The plot came back with 35 jumps. I reduced it to a 16 ton tank, and the plot returned with 33 jumps.
Taking "2 jumps less" as the average over 1000 LY, that means it's 26 x 2 = 52 jumps less if you have a smaller tank. 52 jumps may seem "small" but if we take the average of 1 minute per jump (it's actually less, around 45 sec to 55 sec if you're quick), that is 52 minutes LONGER you spend jumping. Or 45 mins LONGER, even if you're very quick to chain your jumps together.
So you will have to decide if it's worth spending 52 minutes longer jumping to feel safe, or when 1.3 hits, carrying an extra tank will mean weighing you down more and increase your jump from "2 jumps more" to "4 jumps more", which could translate to 2 hours more jumping time![]()
Not an issue with smaller ships? Heh. You realize I ran my Hauler with a half-size tank, right?