2011 Hyundai Sonata Hybrid Hyundai plans to meet the 35-mpg fleet average by 2015.BY ALISA PRIDDLE AND JON YANCA Hyundai used the L.A. auto show to announce its first U.S.-market hybrid vehicle. The next-generation Hyundai Sonata will be a full hybrid, meaning it can run on electricity alone at low speed and for a limited distance.Hyundai will use a unique version of a two-mode—or parallel—hybrid