The RX 350 is powered by a 270-hp 3.5-liter V6 with a six-speed automatic transmission delivering performance, and fuel efficiency. It is available with a choice of front- or all-wheel drive. Standard features include automatic climate control, push-button start with smart keyless entry, automatic headlamps, 18-inch aluminum wheels, ten airbags, active front head restraints and leather trim on the steering wheel and shift knob. For 2012, the RX 350's engine can now run on regular unleaded instead of premium fuel. Smart Stop Technology has also been added.