I was doing some fuel testing in solo and noticed a very bad fuel bug on the A350: at FL430 (and probably at other altitudes as well), the fuel flow decreases when you increase throttle from 88% to 90% (thrust, not speed, somewhere around there). I encountered an anonaly when doing fuel testing before when lower weight required more fuel, probably this same bug.
There has been a problem with the A350 since release where cruising above FL350 is never the most efficient altitude. I’m now wondering if this has to do with it.
Update: two screenshots showing the problem. Note higher thrust but lower fuel flow.