Introduced last year, the Buick Enclave returns for 2009 in CX and CXL models with more convenience features and a new 3.6-liter V-6 direct injection engine as the standard power plant. The full-size luxury crossover has seating for eight and lots of cargo room while delivering 16 mpg city, 22 highway for all-wheel-drive models, according to EPA estimates (although TheCarConnection.com's editors believe those figures to be optimistic).