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Used 2018 BMW 6 Series | Used 2019 BMW 6 Series | Used 2018 Cadillac CT6 | Used 2018 Audi A8 | ||
640i Gran Coupe xDrive 4D Sedan | 640i Gran Turismo xDrive Sedan 4D Sedan | 3.0 Twin Turbo Luxury Sedan 4D Sedan | L 4.0T Sport Sedan 4D Sedan | ||
| Starting Price | $26,500 | $24,500 | $21,700 | $25,800 | |
| KBB Expert Rating | 4.4 | 3.7 | 4.2 | 3.9 | |
| Consumer Rating | |||||
| Fuel Economy | City 19/Hwy 28/Comb 22 MPG | City 20/Hwy 28/Comb 23 MPG | City 18/Hwy 26/Comb 21 MPG | City 16/Hwy 26/Comb 19 MPG | |
| Fuel Type | Gas | Gas | Gas | Gas | |
| Seating Capacity | 5 | 5 | 5 | 5 | |
| Basic Warranty | 4 years or 50000 miles | 4 years or 50000 miles | 4 years or 50000 miles | 4 years or 50000 miles | |
| Horsepower | 315 @ 5800 RPM | 335 @ 5500 RPM | 404 @ 5700 RPM | 450 @ 5300 RPM | |
| Engine | 6-Cyl, Turbo, 3.0 Liter | 6-Cyl, Turbo, 3.0 Liter | V6, Twin Turbo, 3.0 Liter | V8, Turbo, 4.0 Liter | |
| Drivetrain | AWD | AWD | AWD | AWD |
| Blind-Spot Alert | Optional | Standard | Standard | Standard | ||
| Collision Warning System | Optional | Standard | Standard | Standard | ||
| Emergency & Security Services | Standard | Standard | Standard | Not Available | ||
| Child Seat Anchors | Standard | Standard | Standard | Standard | ||
| Child Door Locks | Not available | Standard | Standard | Standard | ||
| Parental Control System | Not Available | Not Available | Standard | Not Available | ||
| Night Vision System | Optional | Optional | Not Available | Not Available | ||
| Pedestrian Detection System | Optional | Optional | Not Available | Not Available | ||
| Traction Control | Standard | Standard | Not Available | Standard | ||
| Side View Cameras | Optional | Not Available | Standard | Not Available | ||
| Surround View Camera | Not Available | Optional | Standard | Not Available | ||
| Top View Camera | Optional | Not Available | Standard | Standard |
| Bluetooth Wireless Technology | Standard | Standard | Standard | Standard | ||
| Cruise Control | Standard | Standard | Standard | Standard | ||
| Remote Keyless Entry | Standard | Standard | Standard | Standard | ||
| Remote Engine Start | Not Available | Not Available | Standard | Not Available | ||
| Smartphone Interface | Standard | Standard | Standard | Not Available | ||
| Internet Access | Standard | Standard | Standard | Standard | ||
| Proximity Sensing Keyless Entry | Standard | Standard | Not Available | Standard | ||
| Push-Button Engine Start | Standard | Standard | Not Available | Not Available | ||
| Navigation System | Standard | Standard | Standard | Standard | ||
| Voice Recognition System | Standard | Standard | Standard | Standard | ||
| Real-Time Traffic Information | Standard | Standard | Not Available | Standard | ||
| Touch Screen Monitor | Standard | Standard | Standard | Not Available | ||
| Hands Free Phone | Standard | Standard | Standard | Standard |
| iPod Connector | Not Available | Not Available | Not Available | Standard | ||
| iPod Interface | Not Available | Not Available | Not Available | Standard | ||
| Premium Radio | Optional | Optional | Standard | Standard | ||
| Bluetooth Streaming Audio | Standard | Not Available | Standard | Standard | ||
| Bluetooth Wireless Technology | Standard | Standard | Standard | Standard | ||
| Satellite Radio | Standard | Standard | Standard | Standard |
| Remote Control Liftgate/Trunk Release | Standard | Not Available | Not Available | Not Available | ||
| Remote Keyless Entry | Standard | Standard | Standard | Standard | ||
| Cruise Control | Standard | Standard | Standard | Standard | ||
| Bluetooth Streaming Audio | Standard | Not Available | Standard | Standard | ||
| Heated Mirrors | Standard | Standard | Standard | Standard | ||
| Heated Steering Wheel | Optional | Optional | Standard | Standard | ||
| Integrated Garage Door Opener | Standard | Standard | Standard | Standard |
| Torque | 330 @ 5800 RPM | 330 @ 5500 RPM | 400 @ 5700 RPM | 444 @ 5300 RPM | ||
| 0 to 60 | 5.2 seconds | 5.1 seconds | Not Available | 4.4 seconds | ||
| Top Speed | 130 mph | 130 mph | Not Available | 130 mph |
| Leather Seats | Standard | Standard | Standard | Standard | ||
| Folding Rear Seat | Standard | Standard | Not Available | Not Available | ||
| Dual Power Front Seats | Standard | Standard | Standard | Standard | ||
| Power Driver's Seat | Standard | Standard | Standard | Standard |
| Leather-Wrapped Steering Wheel | Standard | Standard | Standard | Not Available | ||
| Power Outlet | Not Available | Standard | Standard | Standard | ||
| Power Windows | Standard | Standard | Standard | Standard | ||
| Rear Window Defroster | Standard | Standard | Not Available | Standard | ||
| Steering Wheel Controls | Standard | Standard | Not Available | Standard | ||
| Tilt Steering Wheel | Standard | Standard | Standard | Standard | ||
| Tilt/Telescoping Steering Wheel | Standard | Standard | Standard | Standard | ||
| Cup Holder Count | Standard | Standard | Standard | Standard |
| Adaptive Headlights | Standard | Not Available | Not Available | Not Available | ||
| Alloy Wheels | Standard | Standard | Standard | Standard | ||
| Fog Lights | Standard | Not Available | Not Available | Standard | ||
| Panorama Moon Roof | Not Available | Standard | Optional | Standard | ||
| Power Liftgate/Trunk Release | Not Available | Standard | Standard | Standard | ||
| Power Folding Exterior Mirrors | Standard | Standard | Standard | Standard | ||
| Rear Spoiler | Not Available | Not Available | Optional | Not Available | ||
| Rain Sensing Windshield Wipers | Standard | Standard | Standard | Standard |
| Alarm System | Standard | Standard | Standard | Standard |
| Drivetrain | AWD | AWD | AWD | AWD | ||
| Hill Descent Control | Standard | Not Available | Not Available | Not Available | ||
| Recommended Fuel | Premium | Premium | Premium | Premium | ||
| Stability Control | Standard | Standard | Not Available | Standard | ||
| Transmission Type | Automatic | Automatic | Automatic | Automatic |
| Curb Weight | 4330 pounds | 4464 pounds | 4099 pounds | 4673 pounds | ||
| Fuel Capacity | 18.5 gallons | 18 gallons | 19.5 gallons | 21.7 gallons | ||
| Front Head Room | 40.6 inches | 39.4 inches | 40.2 inches | 37.2 inches | ||
| Front Leg Room | 42.1 inches | 41.1 inches | 46.4 inches | 41.4 inches | ||
| Minimum Ground Clearance | 5 inches | 5.4 inches | Not Available | Not Available | ||
| Overall Length | 197.1 inches | 200.9 inches | 204.1 inches | 207.4 inches | ||
| Front Shoulder Room | 59.7 inches | 60 inches | 58.3 inches | 59.1 inches | ||
| Turning Diameter | 39.2 feet | 41 feet | Not Available | 41.7 feet | ||
| Wheel Base | 116.9 inches | 120.9 inches | 122.4 inches | 122.9 inches | ||
| Width with mirrors | 82.3 inches | 85 inches | Not Available | 83.1 inches |
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