Engine: 4.6-liter DOHC 32-valve V8

Engine Options: 3.6-liter double overhead-cam 24-valve V6 w VVT; 4.6-liter DOHC 32v V8 w VVT; 4.4-liter DOHC 32v supercharged V8

Transmission: 5-speed automatic

Transmission Options: 5-speed automatic, 6-speed automatic

Standard Safety Equipment: dual two-stage frontal airbags; front seat-mounted side-impact airbags; front and rear-seat side curtain airbags; antilock brakes; traction control; Stabilitrak electronic stability control; rear park assist; rear seat child safety seat anchors

Optional Safety Equipment: tire pressure monitoring system

Basic Warranty: 4 years/50,000 miles

Assembled In: Lansing, Michigan

Model Tested: Cadillac STS V8 ($47,520)

Standard Equipment: dual-zone, automatic climate control; auto headlamps; OnStar safety warning and communication system (one year service included); remote keyless unlock and start; programmable remote garage opener system; power windows; 8-way front seats; heated outside mirrors; power tilt and telescope steering wheel; memory for driver's seat, outside mirrors and steering wheel; AM/FM/CD stereo with dash-mounted 6-disc changer; leather-trimmed, heated/ventilated front seats and heated rear seats; front and rear floormats

Options as Tested: AM/FM stereo with 6CD/DVD changer and navigation system, XM Satellite Radio (3-month trial service included), HID headlamps with washers, Magnetic Ride Control suspension, wood/leather-rimmed steering wheel, power moonroof, tire pressure monitor, rear spoiler, polished cast aluminum wheels, rain-sensing windshield wipers, performance brakes, limited slip rear differential, Tuscany leather-trimmed seats, heavy-duty cooling system, variable assist/ratio steering ($13,115); all-wheel drive ($1900); adaptive cruise control with head-up instrument display ($2300)

Destination Charge: 695

Gas Guzzler Tax: 1000

Layout: all-wheel drive

Horsepower: 320 @ 6400

Torque: 315 @ 4400

Miles Per Gallon in the City/Highway: 18/26

Wheelbase: 116.4 inches

Length/Width/Height in Inches: 196.3/72.6/57.6 inches

Track Front/Rear: 61.8/62.3 inches

Turning Cycle: 38.8 feet

Seating Capacity: 5 people

Head/Hip/Leg Room, f: 38.7/54.6/42.6 inches

Head/Hip/Leg Room, m: inches

Head/Hip/Leg Room, r: 37.9/55.6/38.3 inches

Trunk Volume: 13.8 cubic feet

Payload:

Suspension, f: independent, coil springs, stabilizer bar

Ground Clearance: 5.5 inches

Curb Weight: 4230 pounds

Towing Capacity: 1000 pounds

Tires: P235/50WR18 front; P255/45WR18 rear

Brakes: disc/disc with ABS, electronic stability control

Fuel Capacity: 17.5 Gallons