If you go to Ramtrucks.com and build a Etorque or Hemi quad cab Laramie you will see that the standard tank is 23 gals and you have an option for a 33. If you build a crew cab Laramie you will see options for both 26 and 33 gal tanks....and if you don't pick either then the standard options list does not show a fuel tank so I think that the 26 is standard because its cost is $0.
obviously I didn't check all the trim levels but this was enough to confirm to me the existence of the 23 gal tank as standard for the eTorque.
I have no dog in this fight as my EcoD averaged 25mpg last tank for over 800 mile range. Hope to beat that this tank.