Japanese cars top annual

Scores are based not only on fuel economy but also emissions tied to smog and global warming. Thus, while the natural gas Honda and the Toyota Corolla mileage are nearly half that of the top hybrid models, their overall score was high due to very low emissions. Natural gas, in particular, is much cleaner burning than gasoline.

The ranking also listed vehicles by category, and the ACEEE noted that U.S. automakers took the top spot there in just four of the 14 vehicle classes.

MSNBC