I misread the sticker at first, my bad. Yeah so it comes along with that engine, the 23 gallon tank for 2020-2021 models. It was a 26 gallon tank for 2019's.
Ok so standard you have 26 for that trim, cab, bed, drivetrain config. However, because you opted for the eTorque, you unfortunately have the 23 gallon tank. Point is, I believe, you have the 23 gallon tank. So, like I said earlier, options negate std features. Apologies for the confusion earlier.
Edit: Different Configs and Trims may yield different tank sizes with that eTorque Hemi, all I know is, that a '21 in a Big Horn 5'7" Bed Crew Cab 4x4 its 26 std, and its 23 if ya get that engine on top of that config.