Yes the AT-PZEV, sold in the green states and like I have, only holds 11.9 gallons.
The ULEV sold in the non-green states holds 13.2 gallons.
So it's not fair to compare.

Also, my 04 HCH owners manual says don't run to tank too low.
It can cause the engine to misfire and damage the catalytic converter.

You guys are crazy to run your tanks dry.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.