Let me see if I got this straight. I'm getting my statistics from AutoWeb.com:
http://tinyurl.com/dka5z
The PT Cruiiser is smaller on the outside, but has more cargo and passenger room in every dimension except .4" shorter front head room (who really needs more than 39").
It's amazing, the PT is 2" narrower, but has 1" more shoulder room. The PT is 7.4" shorter, but has more cargo room adn legroom.
The PT Cruiser is (probbaly) lighter, but more powerful (even in the non-turbo)
The PT has 7yr/70,000 mile powertrain warranty to the HHR's 3/36,000
The PT has a great reliability record, while the HHR is unknown.
But somehow the HHR gets the "nod".
That's interesting.