Lexus designed the HS 250h from the ground up to be a hybrid vehicle. As such, it manages to achieve 35 combined mpg yet still maintain Lexus standards of comfort and performance. Safety is also a focus of the HS-- it features a total of ten airbags and class-leading accident-avoidance features. Standard features are very generous, but some exciting technology is optional, such as Lane-Keep Assist, a Heads-Up Display and a 15-speaker Mark Levinson sound system.