Yes, all of you is right. I jumped back and forth between systems that were 36,5, while my maximum range on filled tank is 37. On the last jump, I had completly depleted the tank, meaning that only the SC tank was left. If that star wasn't scoopable I would have died trying to SC to the station.
So if the route plotter throws a full 37 I wouldn't make the 4th jump at full range.
So 28T lets you do 3,9 jumps, or 3 ar full range and one around 35.
Fact is that, mainly thanks to others suggestions on the DW main thread, I came with a fit that can boost, has 5D shields, 2 SRVs, and downgrading the tank to 28T still jumps 37-38,3.
When I'll be back home I'll try a quick trip over omega nebula, and see if that 4 less tons of fuel poses threats to my playstyle or not. Usually I top the tank at every scoopable flying by at full speed, but I don't want to make an entire expedition always in costant worry of the fuel gauge.
Also I'm still undecided about boost. The definitive answer does not exist, all the pros and cons have been considered, I have to understand what works for me.
On one side I've landed so many times on Achenar 3 that I know I don't need boost. On the same time for my personal me, boosting is dangerous,to the point that I binded a sequence of 2 buttons too boost, so I can do only for fun,and I really have to think how to move my finger before boosting, so it can't be an impulse.
On the other side the Anaconda stripped down too much feels just a frame with a thruster from an RP point of wiev, while knowing I can boost if I want, more than beeing usefull in itself, makes me feel the ship more real. And maybe if I land 20km from the group I can think to reach the, before gerring old and stuff.
Shields are the same, I could do with 3D, but 5D makes me feel a ship I'm proud to command since it feels stronger in my mind.
I'm not afraid of mistakes, I am aware that I'll have to leave in that ship for 6 months (i consider to go to abyssal plane after beagle), and I want to feel good every time I log in.