The 2009 Chevy HHR offers sport utility seating and cargo carrying capabilities on a small-car platform. The 155-hp base 2.2L Ecotec engine achieves 32 mpg on the highway, while the 2.4L engine upgrade provides 23 more horsepower and achieves 28 mpg on the highway. Even the 260-hp turbocharged SS manages 29 mpg highway with manual transmission and 28 mpg highway with the automatic transmission.