Same issue here with a sidewinder and 4 tons liquidors. I've sold my lasers and still cannot reach morgor. I don't know what i can do, i don't want to give up this cargo.
removing 8t of lasers should be enough i'd think.
sometimes making a jump for nothing may help reduce youd fuel hence your mass. But if you just wait enough eventually you may be able to do the same by consuming some exta mass of fuel and get some more range(up to the point where it reduces your range).
You could also use supercruise to consume it a bit faster.
the other option is to jettison some cargo, jump, buy back the missing ones at some more reachable place and complete the mission then.
by the way, "liquidor"? did you mean liqueur?
Has anyone calculated how much tons of fuel each ship is carrying(both tanks or total)?
It could simply be done by checking how much % correspound to how many tons of fuel when you're about to refuel(the mass of the fuel you want to buy is indicated).
Edit :
think i got the numbers for sidewinders :
Reservoir = 0.3t
Fuel Tank = 2t <= this is what's used for hyperspace, each time you empty the Reservoir, 0.3t will be taken from that one, so be carreful about that too.
i cant say how much fuel you need to make that specific jump though, but you have about 6.36LY to go