The 2015 Lexus LS 460, with 87,089 miles on the odometer, is the embodiment of quiet, understated Japanese luxurya flagship sedan that has spent nearly a decade delivering the serene, vaultlike refinement and bulletproof dependability that have made the LS a legend among executive transports. Its silken 4.6liter V8 produces 386 horsepower with the kind of effortless, turbinesmooth acceleration that makes highway cruising feel like a gentle glide, while the air suspension and adaptive damp