Filed under: Minivans/MPVs, ChevroletThe Chevy HHR has been quite the sleeper hit for General Motors. Through September, 85,662 units of the High Heritage Roof retro wagon have been sold, with sales up over 14% so far this year over last. That still puts the HHR about 20,000 units behind its direct competitor, the Chrysler PT Cruiser, but sales of that model are up only 5%. And General Motors is capitalizing on the HHR by introducing new variants for consumers to consider. The HHR Panel was r...