(http://media.il.edmunds-media.com/toyota/prius/2011/ns/2011_toyota_prius_prf_ns_70811_196.jpg) The Toyota Prius is the top non-luxury hybrid in the 2011 Hybrid Scorecard compiled by the Union of Concerned Scientists. But the group said the Volkswagen Touareg Hybrid was the "worst offender" when it came to cutting pollution.