Son's Automotive Group Compares 2017 BMW 7 SERIES VS 2017 Cadillac CT6 Near Duluth, GA

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2017 Cadillac CT6

Safety Comparison

The 7 Series’ driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The CT6 doesn’t offer a driver alert monitor.

Both the 7 Series and the CT6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available all wheel drive, crash mitigating brakes, night vision systems, lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

Warranty Comparison

The 7 Series’ corrosion warranty is 6 years longer than the CT6’s (12 vs. 6 years).

Reliability Comparison

J.D. Power and Associates’ 2016 Initial Quality Study of new car owners surveyed provide the statistics that show that BMW vehicles are better in initial quality than Cadillac vehicles. J.D. Power ranks BMW fifth in initial quality, above the industry average. With 18 more problems per 100 vehicles, Cadillac is ranked 16th, below the industry average.

From surveys of all its subscribers, Consumer Reports’ April 2017 Auto Issue reports that BMW vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks BMW13 places higher in reliability than Cadillac.

Engine Comparison

The 7 Series has more powerful engines than the CT6:




740i 3.0 turbo 6 cyl.

320 HP

332 lbs.-ft.

740e 2.0 turbo 4 cyl. hybrid

322 HP

369 lbs.-ft.

750i 4.4 turbo V8

445 HP

479 lbs.-ft.

Alpina B7 xDrive 4.4 turbo V8

600 HP

590 lbs.-ft.

M760i 6.6 turbo V12

601 HP

590 lbs.-ft.

CT6 2.0 turbo 4 cyl.

265 HP

295 lbs.-ft.

CT6 3.6 DOHC V6

335 HP

285 lbs.-ft.

CT6 3.0 turbo V6

404 HP

400 lbs.-ft.

As tested in Motor Trend the BMW 7 Series is faster than the Cadillac CT6 twin turbo V6:



Alpina B7


Zero to 60 MPH

4.3 sec

3.4 sec

5.1 sec

Quarter Mile

12.7 sec

11.6 sec

13.6 sec

Speed in 1/4 Mile

111.9 MPH

122 MPH

102.3 MPH

As tested in Car and Driver the Alpina B7 is faster than the Cadillac CT6 2.0:


7 Series


Zero to 60 MPH

3.4 sec

6.1 sec

Zero to 100 MPH

7.8 sec

17.6 sec

5 to 60 MPH Rolling Start

4.3 sec

7 sec

Quarter Mile

11.6 sec

14.7 sec

Speed in 1/4 Mile

122 MPH

92 MPH

Top Speed

193 MPH

193 MPH

Fuel Economy and Range Comparison

On the EPA test cycle the 740e running its gasoline engine gets better fuel mileage than the CT6 3.6 V6 AWD (25 city/29 hwy vs. 18 city/27 hwy). The 740e running on electricity gets better fuel mileage than the CT6 3.6 V6 AWD (62 city/68 hwy MPGe vs. 18 city/27 hwy).

On the EPA test cycle the 7 Series gets better fuel mileage than the CT6:



7 Series






18 city/27 hwy

3.6 V6/Auto



19 city/28 hwy

18 city/26 hwy

3.0 twin turbo V6/Auto

The 740e can drive on battery power alone for up to 14 miles. The CT6 must run its internal combustion engine to move.

Regenerative brakes improve the 7 Series’ fuel efficiency by converting inertia back into energy instead of wasting it. The CT6 doesn’t offer a regenerative braking system.

The 7 Series’ standard fuel tank has 1.4 gallons more fuel capacity than the CT6 (20.6 vs. 19.2 gallons).

Brakes and Stopping Comparison

For better stopping power the 7 Series’ brake rotors are larger than those on the CT6:




CT6 2.0


Front Rotors

13.7 inches

15.5 inches

12.6 inches

13.6 inches

Rear Rotors

13.6 inches

14.5 inches

12.4 inches

12.4 inches

The 7 Series stops much shorter than the CT6:


7 Series



70 to 0 MPH

151 feet

164 feet

Car and Driver

60 to 0 MPH

113 feet

117 feet

Motor Trend

Tires and Wheels Comparison

For better traction, the 7 Series has larger standard tires than the CT6 (245/50R18 vs. 235/50R18). The Alpina B7 xDrive’s optional tires are larger than the largest tires available on the CT6 (F:255/35R21 & R:295/30R21 vs. 245/45R19).

The Alpina B7 xDrive’s optional 255/35R21 front and 295/30R21 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the CT6’s optional 40 series tires.

For better ride, handling and brake cooling the Alpina B7 xDrive offers optional 21-inch wheels. The CT6’s largest wheels are only 20-inches.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 7 Series can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The CT6 doesn’t offer run-flat tires.

Suspension and Handling Comparison

The 7 Series offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The CT6 doesn’t offer an active sway bar system.

The front and rear suspension of the 7 Series uses air springs for a smoother, controlled ride than the CT6, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The 7 Series offers an available active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Cadillac doesn’t offer an active suspension on the CT6.

The 7 Series has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The 7 Series’ height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The CT6 doesn’t offer a load leveling suspension.

For a smoother ride and more stable handling, the 7 Series’ wheelbase is 4 inches longer than on the CT6 (126.4 inches vs. 122.4 inches).

The Alpina B7 xDrive handles at .97 G’s, while the CT6 pulls only .81 G’s of cornering force in a Car and Driver skidpad test.

The 750i xDrive executes Motor Trend’s “Figure Eight” maneuver 1.3 seconds quicker than the CT6 (25.4 seconds @ .75 average G’s vs. 26.7 seconds @ .66 average G’s).

Chassis Comparison

As tested by Car and Driver, the interior of the 750i xDrive is quieter than the CT6 AWD:


7 Series


At idle

38 dB

49 dB


72 dB

73 dB

Passenger Space Comparison

The 7 Series has 1 inch more front shoulder room, .9 inches more rear headroom, 4 inches more rear legroom and 1.5 inches more rear shoulder room than the CT6.

Cargo Capacity Comparison

A low lift-over trunk design makes loading and unloading the 7 Series easier. The 7 Series’ trunk lift-over height is 27.2 inches, while the CT6’s liftover is 29.1 inches.

A standard locking glovebox keeps your small valuables safer in the 7 Series. The CT6 doesn’t offer locking storage for small valuables.

Ergonomics Comparison

If the windows are left down on the 7 Series the driver can raise them all using the key in the outside lock cylinder. On a hot day the driver can lower the windows from outside the vehicle using the key in the outside lock cylinder or the keyless remote. The driver of the CT6 can only raise the windows from inside the vehicle, with the ignition on.

The 7 Series’ rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The CT6’s standard intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

The CT6 Luxury/Premium/Platinum’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The 7 Series’ standard adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

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