My ‘06 doesn’t have the back or DTE display. What Bluetooth scanner are you using? I’ve got an iPad I I could use for this.Yep, my experience as well. You can run it down to the stars and it'll only hold about 24 - kinda defeats the point of having a 28 gallon tank if it's going to lie to you about how much you have left.
One thing I have found though is that the OBD-II data does not lie. I have a bluetooth OBD scanner connected to my tablet and just go by the percentage of fuel it says is left. When the stars come out, it says there is 15% left in the tank... I'll run it down to about 5% before I chicken out and get gas.