Basically unchanged for 2009, the Infiniti M45 midsize luxury sedan is equipped with a powerful, 4.5L V8 engine that provides up to 325 hp and 336 lb-ft of torque with rear-wheel drive, although all-wheel drive is also available. The five-speed automatic transmission has manual shift control and a sporty downshift rev-matching feature. As for fuel economy, the AWD trim gets 14 mpg city/20 mpg hwy, while the RWD trim attains 16 mpg city/21 mpg hwy. Designed more for luxury than sport, the M45 Base comes with climate-controlled seats, adaptive xenon headlights and wood/metal trim. The Infiniti M45 Sport trim is the same as the Base trim on the interior, except for wood-only trim, and features 19-inch wheels and tires, firm suspension and active rear-wheel steering. Options include adaptive cruise control, a Bose surround-sound DVD system, heated/reclining rear seats and a voice-activated navigation system. Standard safety features include stability control, antilock disc brakes with brake assist, stability control, front-seat side airbags, full-length side curtain airbags and active front-seat head restraints.