The popular little HHR has acquired many admirers across a wide range of age and social circles. Its small but relatively powerful engine in the 2.4-liter Ecotec I4 rated at 178 horsepower provide pep in a car with ample headroom and cargo space. The name actually stands for ''Heritage High Roof,'' so it seems as though Chevy is not only aware but proud of the comfort it provides. , The 2006 edition was the first release of this model and the LT was the upscale trim with polished wheels, exhaust, a little better interior, and specific badging letting others know that you were not a base model.