Buick ties with Lexus to rank highest among nameplates in vehicle dependability—marking the first time in 12 years that another brand has tied with Lexus for the highest-rank position, according to the J.D. Power and Associates 2007 Vehicle Dependability Study (VDS). The study, which measures problems experienced by original owners of 3-year-old (2004 model year) vehicles, finds that Buick and Lexus tie for the top rank position with a score of 145 problems per 100 vehicles (PP100). Following in the top five rankings are Cadillac, Mercury and Honda, respectively. Lexus garners five segment awards—the most of any nameplate in 2007—for the GS 300/GS430, GX 470, LS 430, LX 470 and SC 430. Toyota follows with four segment awards for the RAV 4, Sequoia, Tacoma and Tundra. HUMMER is the most improved brand in the study, although it continues to rank below the industry average. HUMMER improves by 65 PP100 since 2006.