Flight Question Usable Fuel Payload

[SpaceCowboyJoe]

Hello everyone. I'm a begginner preparing my first trip to Jupiter (from Mars)
I'm using a XR5 as vessel (Orbiter 2016).

I already made several experiment with Oxigen payload (considering the trip duration it's quite an important factor)
I assumed it would be the same with extra fuel but... apparently not.

I didn't notice any difference in the vessel fuel available loading or unloading several quantities of extra-fuel.

Do any of you attempted anything like that? Am I missing some detail?

 

[turtle91]

I just tried to add some additional fuel within the XR5 default landed at Brighton Beach scenario. For me...it works.
I added a "CSA_XR5_ER_MainFuel"-tank and I can see additional fuel at the lower-panel-fuel-display.

 

[SpaceCowboyJoe]

I just tried to add some additional fuel within the XR5 default landed at Brighton Beach scenario. For me...it works.
I added a "CSA_XR5_ER_MainFuel"-tank and I can see additional fuel at the lower-panel-fuel-display.

Well It's weird to me. I just completed a small flight around Deimos and back landed on Mars.
I see the main fuel level going down quickly then, if I'm unloading and reloading the scenario, is rising up.
I ended the flight with 12% fuel and I reloaded the scenario with 66%...
I can't really say it's a bug. It looks like in certain moment the fuel is getting from the added tanks to the main tank.