I think it is optimized for ships with a fuel scoop. Despite that, I never trust it.While it always seems being correct on system jump fuel calculation, the problem with the Galmap calculator is that it never shows how much fuel will be left for the final SC approach to the station. In my case a SC travel of 100 KLs would have most likely broken my neck.
Btw, situation as shown in the OP happened after just 3 jumps in an FDL without a fuel scoop...
This is only for pilots with big ships. I would love to help others, or at least being able to help, but no smaller ship has the module space to have fuel limpets. Or any limpets. Except if you leave out other things and then have a specialiced ship, which can refuel others - and not more. This is a serious design flaw - IMHO - that you are forced to have a cargo bay and an additional controller space. If you want a rescue ship you will need a repair limpet controller too - this costs 3 valuable slots. No rescue from my ships, sorry.I’ve been rescued.
I’ve rescued folks.
There's also the FSD boost that allows you to jump further than your FSD typically will. I've used that a couple times for fuel reasons.While engineering my Challenger the other day, the map said I could make all the jumps just fine.
So I set off, no scoop.
On my last jump, the blue fuel consumption bar basically emptied the main tank, and left me with about 20% reserve to try and dock with.
Luckily, the base was only a couple of LS away or I would have been screwed. Lol
Way back before Engineering, flying my combat FDL, with its tea cup sized fuel tank, I was coming back from a player escort task, and hit 2 unscoopable stars in a row, and couldn't make the third jump.
Luckily, I remembered you can g economic to save fuel, an did about 4 extra tiny jumps to reach a scoopable star.
I stopped flying the FDL after that. Lol