Engine: 4.6-liter DOHC 32-valve V8

Engine Options: 254-hp 3.6-liter double overhead-cam 24-valve V6 w VVT; 320-hp 4.6-liter DOHC 32-valve V8 w VVT; 469-hp 4.4-liter DOHC 32-valve supercharged V8 w VVT

Transmission: 6-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 ($51,810)

Standard Equipment: dual-zone, automatic climate control; auto headlamps; AM/FM stereo with 6CD/DVD changer; XM Satellite Radio (3-month trial service included); OnStar safety warning and communication system (one year service included); remote keyless unlock and start; rain-sensing windshield wipers; programmable remote garage opener system; power windows; 8-way front seats; heated outside mirrors; power tilt and telescope wood-and-leather steering wheel; memory for driver's seat, outside mirrors and steering wheel; leather-trimmed front and rear floor mats; tire-pressure monitor

Options as Tested: all-wheel drive ($1,550); Luxury Performance Package ($8,190) includes Bose 5.1 surround sound with navigation, Xenon HID headlamps with washers, IntelliBeam automatic high/low beam control with flash to pass feature, interior auto-dimming rearview mirror with OnStar controls, heated and ventilated front seats, premium ZF steering gear, performance cooling package, Magnetic Ride control, rear spoiler, limited slip rear differential, P235/50R18 front tires, P255/45R18 rear tires, Brembo performance brakes and 18-inch 9-spoke polished aluminum; Tuscany premium leather-trimmed seats ($1,295); adaptive cruise control with head-up instrument display ($2,300); power glass sunroof ($1,200)

Destination Charge: 745

Gas Guzzler Tax: 1300

Layout: all-wheel drive

Horsepower: 320 @ 6400

Torque: 315 @ 4400

Miles Per Gallon in the City/Highway:

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, short-and-long control arms, coil springs over shocks, 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

Fuel Capacity: 17.5 Gallons