^^ THIS ^^ How much fuel can you add at any certain gauge reading to make it full? Correlate that to the fuel system capacity, and you'll know if the gauge is off, and how far. Easy peasy.
Welcome to the forum from Colorado!
Parking brakes work on a cable/wire system, separate from the hydraulic brakes. You likely have misadjusted parking brake shoes (inside the rear rotor hat) or stretched/missing parking brake cables, or rusted out backing plates in the rear. Time for a...
I wouldn't recommend throwing an evap canister at it as long as you aren't getting any evap codes, especially since you don't have trouble filling the tank. That's just a distraction. Concentrate on other areas since an evap problem usually doesn't cause driveability issues. Having said that...
Use one of the online GM parts sites -- gmpartsgiant, gmpartsdirect, etc. Enter your VIN and you can find the OE part numbers for purchase there or for searching other parts places.
Like this (but that may not be your SUV)...
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