On both your flights 'fuel used' was exactly the same as 'fuel bought'.
G-AVOE had zero fuel to start with & has zero now. It must have been running on empty for quite a while.
I didn't know FlyNet allowed unlimited fuel. :think:
So you didn't load enough fuel.
As a rough guide for 1-11s, load about 2600 kg of fuel for each hour you expect to fly.
Then add another 1500 kg on top of that.
By the way, I'm not examining every flight you make here.
I just do a quick check down the fuel burn figures on the stats every so often & odd looking numbers stick out like a sore thumb.
Cheers
DM