The thing is that the TBM is still a General Aviation aircraft (a large one, but still one).
By opposition to airlines and professionnal business jet world, pilots mostly plan and fly using fuel volume and not fuel weight.
If you look inside the official TBM PIM, fuel consumption is given for Liters / h, Kgs / h, and USG /h.
Not Lbs/h.
By the way, fuel gauges inside the aircraft are USG.
Having said that, I find more realistic to plan and fly using General Aviation tool, than professionnal tool that don't give you the possibility (PFPX ou Simbrief) to plan using USG/h.
For Europe, I use Autorouter, and for US, I use fltplan.com.
Both are free, and offer stock TBM9 profile.