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"and this pig, while having about the same EPA rating as the XD could barely muster 35 mpg on the level. It was an automatic and the instant you touched the gas pedal - even on a slight downhill, the mpg dropped to 35."
-I almost had an explaination, but then i realized you said HHR not SSR, not sure why SSR was stuck in my head. My guess would be the tuning of the engine, IIRC(probably not) the 1NZ-FE is VVT-i, which would make a difference over the HHR engine which isn't even remotely fancy like that
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