Comparative Automotive Research has identified no less than 50 advantages that the BMW 6 Series Coupe has over the Mercedes C-Class Coupe.

Engine

The 6 Series Coupe (650i, 650i xDrive) has a larger standard engine, a 4.4L V8, than the standard engine in the C-Class Coupe C63 AMG, which has a 6.3L V8.

The standard engine in the 6 Series Coupe 3.0L I6 is more powerful, with more horsepower than the standard engine in the C-Class Coupe 3.5L V6, 315 HP vs. 302 HP.

The 6 Series Coupe's engines reach maximum power at lower RPM's than the C-Class Coupe's engines, as detailed below by trim and engine:

			RPM's to Peak Torque		RPM's to Peak HP
	6 Series Coupe 650i 4.4L V8		1750		5500
	6 Series Coupe 640i 3.0L I6		1400		5800
	6 Series Coupe 650i xDrive 4.4L V8		1750		5500
	C-Class Coupe C350 3.5L V6		3500		6500
	C-Class Coupe C63 AMG 6.3L V8		5000		6500

The standard engines in the 6 Series Coupe have more torque (low-end power) than those in the C-Class Coupe, as detailed by trim and engine below:

			Torque
	6 Series Coupe 640i 3.0L I6		332 lb-ft
	6 Series Coupe 650i 4.4L V8		450 lb-ft
	6 Series Coupe 650i xDrive 4.4L V8		450 lb-ft
	C-Class Coupe C350 3.5L V6		273 lb-ft
	C-Class Coupe C63 AMG 6.3L V8		443 lb-ft

Power-to-weight ratio illustrates the relationship between curb weight and horsepower (Curb Weight / Horsepower). As a rule, the lower the ratio, the faster the vehicle. The 6 Series Coupe, has a lower power-to-weight ratio than the C-Class Coupe, as detailed below by trim level and engine:

			Power To Weight Ratio
	6 Series Coupe 640i 3.0L I6		13.1
	6 Series Coupe 650i 4.4L V8		11
	6 Series Coupe 650i xDrive 4.4L V8		11
	C-Class Coupe C250 1.8L I4		17.2
	C-Class Coupe C350 3.5L V6		12.2

Corrosion Warranty

BMW's corrosion warranty provides better protection than Mercedes-Benz's. This warranty protects against rust-through (sheetmetal perforation).

			Corrosion Warranty Months		Corrosion Warranty Miles
	6 Series Coupe		144		Unlimited
	C-Class Coupe		48		50000

Fuel Economy and Emissions

The 6 Series Coupe has a larger fuel tank than the C-Class Coupe, 18.5 gal. vs. 17.4 gal. This may give it a greater range before having to stop to refuel.

The 6 Series Coupe is more fuel efficient than the C-Class Coupe. Superior fuel efficiency makes the 6 Series Coupe both more environmentally friendly and less expensive to operate than the C-Class Coupe.

			Fuel Economy Hwy		Fuel Economy City
	6 Series Coupe 650i 4.4L V8		22 mpg.		15 mpg.
	6 Series Coupe 640i 3.0L I6		31 mpg.		21 mpg.
	6 Series Coupe 650i xDrive 4.4L V8		20 mpg.		15 mpg.
	C-Class Coupe C350 3.5L V6		28 mpg.		19 mpg.
	C-Class Coupe C63 AMG 6.3L V8		19 mpg.		13 mpg.

*Mileage statistics shown are for each vehicle with its standard transmission. Fuel economy is only compared for like engines (i.e. 4 cyl. to 4 cyl.)

The 6 Series Coupe gets more miles from a tank of fuel than the C-Class Coupe, as detailed below by trim and engine:

			Driving Distance
	6 Series Coupe 640i 3.0L I6		462.5 mi.
	6 Series Coupe 650i 4.4L V8		314.5 mi.
	6 Series Coupe 650i xDrive 4.4L V8		314.5 mi.
	C-Class Coupe C350 3.5L V6		382.8 mi.
	C-Class Coupe C63 AMG 6.3L V8		261 mi.

Airbags

Both the 6 Series Coupe and the C-Class Coupe feature Standard driver and passenger air bags.

General Safety

According to the National Highway Traffic Safety Administration, heavier vehicles are safer in collisions and less affected by crosswinds than lighter vehicles. The 6 Series Coupe is heavier than the C-Class Coupe, shown below by trim level and transmission type:

			Curb Weight MT		Curb Weight AT
	6 Series Coupe 650i		4233 lbs.		4,233 lbs.
	6 Series Coupe 640i		-		4,001 lbs.
	6 Series Coupe 650i xDrive		-		4,387 lbs.
	C-Class Coupe C250		-		3,538 lbs.
	C-Class Coupe C350		-		3,693 lbs.
	C-Class Coupe C63 AMG		3935 lbs.		-

According to the Insurance Institute for Highway Safety, longer vehicles can protect you better in both single and multiple-vehicle crashes because they have longer crumple zones, which can reduce damage to the internal safety cage and spread the crash forces. The 6 Series Coupe is longer than the C-Class Coupe, as shown below:

			Length
	6 Series Coupe		192.8 in.
	C-Class Coupe C250		180.7 in.
	C-Class Coupe C350		180.7 in.
	C-Class Coupe C63 AMG		185.3 in.

The 6 Series Coupe features the following available engine drive types, shown by trim:

			Driveline
	6 Series Coupe		AWD
	C-Class Coupe		RWD

An anti-theft stereo is offered as a Standard feature on the 6 Series Coupe. This provides a strong theft deterrent, as the radio is disabled and rendered useless when removed from the vehicle. This anti-theft feature is Not Available in the C-Class Coupe.

The 6 Series Coupe come with an Standard vehicle theft tracking/notification system that can assist authorities to track and pin-point vehicle location in the event of theft. This type of theft tracking system is Optional in the C-Class Coupe.

An advanced night vision system is offered as Optional equipment on the 6 Series Coupe. This system augments a driver's normal vision by utilizing thermal imaging technology to detect objects that may not have normally been seen because of poor visibility conditions. Night vision is Not Available in the C-Class Coupe.

The 6 Series Coupe features Standard headlight washers which keep headlight lenses clean and their output high. Headlight washers are Optional on the C-Class Coupe.

High intensity discharge (HID) headlights are Standard on the 6 Series Coupe but Optional C-Class Coupe. HID headlights offer several advantages - increased visibility due to significantly brighter light, longer lasting/more durable bulbs and much lower energy use.

For improved driving safety in inclement weather, the 6 Series Coupe features Standard windshield wiper activated headlights - a system that automatically activates the parking lights and headlights after the wipers have been turned on. This feature is Not Available on the C-Class Coupe.

Interior Space

The 6 Series Coupe has more interior space than the C-Class Coupe in the following areas:

			Leg Room, Front		Shoulder Room, Front		Head Room, Rear		Head Room, Front
	6 Series Coupe 650i		42.1 in.		56.9 in.		35.7 in.		40.0 in.
	6 Series Coupe 640i		-		56.9 in.		35.7 in.		40.0 in.
	6 Series Coupe 650i xDrive		-		56.9 in.		35.7 in.		40.0 in.
	C-Class Coupe		42.0 in.		54.0 in.		35.5 in.		37.0 in.

Cargo Space

The 6 Series Coupe has a Optional rear seat pass through, allowing very long items, like snow skis to be transported inside the vehicle. A rear seat pass through is Not Available in the C-Class Coupe.

Payload and Towing

To compensate for the increased load placed upon the suspension during towing, the 6 Series Coupe has Standard automatic load-leveling, which automatically adjusts its suspension height for the best possible ride and handling.

General Suspension

The 6 Series Coupe features a Standard adaptive variable suspension that can electronically sense and adapt to changing road surface conditions to provide optimum vehicle handling characteristics. This type of suspension is Optional in the C-Class Coupe (C250, C350).

Chassis

The 6 Series Coupe's wheelbase is longer than the C-Class Coupe's, producing a smoother ride and more stable handling, as detailed below:

			Wheelbase
	6 Series Coupe		112.4 in.
	C-Class Coupe C250		108.7 in.
	C-Class Coupe C350		108.7 in.
	C-Class Coupe C63 AMG		108.9 in.

Wheels and Tires

The 6 Series Coupe (650i, 650i xDrive) comes standard with lower profile, 40 series tires (height to width ratio), which may provide better handling than the 45 series tires standard on the C-Class Coupe (C250, C350).

The 6 Series Coupe come with Standard self sealing/run flat tires, allowing drivers to continue driving, and reach assistance, in the event of a tire puncture. Self sealing/run flat tires are Not Available on the C-Class Coupe.

Additional Features

The Standard multi-adjustable power passenger seat in the 6 Series Coupe allows the front seat passenger to customize their seating position for maximum comfort. Multi-adjustable power passenger seats are Not Available in the C-Class Coupe.

The Optional cooled front seats in the 6 Series Coupe offer increased comfort on very hot days by reducing the temperature of the seating surface. Cooled front seats are Not Available in the C-Class Coupe.

Leather seating is a much sought after feature for new car buyers, offering exceptional luxury and style, superior comfort, ease of maintenance and improved resale value. Leather seating is Standard in the 6 Series Coupe but is Optional in the C-Class Coupe.

The 6 Series Coupe features a Standard navigational aid system, providing maps, driving directions and location assistance. A navigation system is Optional in the C-Class Coupe.

The Optional intelligent cruise control system in the 6 Series Coupe allows it to keep moving at a set speed, without using the gas pedal, while automatically maintaining a set interval from the vehicle traveling in front. Intelligent cruise control is Not Available in the C-Class Coupe.

The 6 Series Coupe features Standard genuine wood interior trim, made from real wood veneers. Real wood interior trim is Optional in the C-Class Coupe (C250, C63 AMG).