The 2018 BMW 6 Series Convertible gets a 3-liter I6 under the hood that makes 315 hp @ 5800 rpm horsepower and 330 lb.-ft. @ 1300 rpm of torque. This engine is quite fuel-efficient and helps the car deliver a mileage of 20 mpg in the city and 29 mpg on the highway. The combined efficiency of the engine comes out to be 23 mpg as rated by the EPA.

For the performance-oriented buyers, BMW provides an option to choose another engine. It's a 4.4-liter V8 motor that churns out 445 hp @ 5500 rpm horsepower and 480 lb.-ft. @ 2000 rpm of torque. The engine is a gas guzzler and provides an efficiency of 17 mpg in the city, 25 mpg on the highway and combined mileage of 20 mpg. The total fuel-tank capacity of the car is 18.5 gallons and you can travel up to 314.5/462.5 miles once it's full.

2018 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg29 mpg23 mpg18.5 gal.350.2/515.0 mi.
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)19 mpg28 mpg22 mpg18.5 gal.351.5/518.0 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg25 mpg20 mpg18.5 gal.314.5/462.5 mi.
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)16 mpg25 mpg19 mpg18.5 gal.296.0/462.5 mi.

Used 2018 BMW 6 Series Convertible For Sale

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2017 BMW 6 Series
11
Price Drop, $1900
Previous Price: $3549917 Aug 2022

2017 BMW 6 Series 640i Coupe

640i xDrive 2dr Coupe AWD (3.0L 6cyl Turbo 8A)

$33,599
Est. $456/mo
Excellent Deal
$3,917 Below market
RMV: $37,516
Copiague, NY
2018 BMW 6 SeriesHome Delivery
7
Price Drop, $1000
Previous Price: $5299803 Jun 2022

2018 BMW 6 Series 650i Convertible

650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)

$51,998
Est. $705/mo
Good Deal
$5,694 Below market
RMV: $57,692
Sterling, VA
2018 BMW 6 SeriesHome Delivery
23
Price Drop, $1676
Previous Price: $4899809 Jun 2022

2018 BMW 6 Series 640i Convertible

640i 2dr Convertible (3.0L 6cyl Turbo 8A)

$47,322
Est. $642/mo
Good Deal
$5,126 Below market
RMV: $52,448
Fort Pierce, FL
2018 BMW 6 Series
24
Price Drop, $100
Previous Price: $5295522 Aug 2022

2018 BMW 6 Series 640i Convertible

640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)

$52,855
Est. $717/mo
Good Deal
$5,563 Below market
RMV: $58,418
Dayton, OH
2018 BMW 6 Series
21
Price Drop, $865
Previous Price: $5185016 Aug 2022

2018 BMW 6 Series 640i Convertible

640i 2dr Convertible (3.0L 6cyl Turbo 8A)

$50,985
Est. $692/mo
Good Deal
$5,077 Below market
RMV: $56,062
Scottsdale, AZ
2018 BMW 6 Series
10

2018 BMW 6 Series 640i Convertible

640i 2dr Convertible (3.0L 6cyl Turbo 8A)

$49,588
Est. $673/mo
Good Deal
$4,851 Below market
RMV: $54,439
Salisbury, NC
2018 BMW 6 Series
12
Price Drop, $1007
Previous Price: $4399910 Aug 2022

2018 BMW 6 Series 640i

640i xDrive 4dr Sedan AWD (3.0L 6cyl Turbo 8A)

$42,992
Est. $583/mo
Good Deal
$4,198 Below market
RMV: $47,190
Shrewsbury, MA
2017 BMW 6 SeriesHome Delivery
12
Price Drop, $1005
Previous Price: $4099921 Aug 2022

2017 BMW 6 Series 650i

650i 4dr Sedan (4.4L 8cyl Turbo 8A)

$39,994
Est. $542/mo
Good Deal
$3,876 Below market
RMV: $43,870
Diberville, MS
2019 BMW 6 SeriesHome Delivery
19
Price Drop, $57
Previous Price: $5799620 Jun 2022

2019 BMW 6 Series 650i

650i xDrive 4dr Sedan AWD (4.4L 8cyl Turbo 8A)

$57,939
Est. $786/mo
Good Deal
$5,539 Below market
RMV: $63,478
Rockland, MA
When it comes to fuel economy, the 2018 BMW 6 Series Convertible is the least efficient of the lot. The car offers 18 mpg in the city, 27 mpg on the highway and combined efficiency of 21 mpg. All other rivals offer almost similar mpg figures but the 2018 BMW 6 Series Convertible still goes down with its poorest mileage.

Its low MPG figures also hinder the overall travel range on a full tank which comes out to be 296.0/462.5 - 351.5/518.0 miles. The most efficient car amongst the competition is the 2018 Porsche 911 Carrera Convertible with a mileage of 19.5 mpg in the city and 28.5 mpg on the highway. It has a total travel range of 338.00 / 490.10 - 340.10 / 501.20 miles on a full tank.

2018 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2018 BMW 6 Series Convertible16 - 20 mpg25 - 29 mpg19 - 23 mpg18.5 gal.296.0/462.5 - 351.5/518.0 mi.
2018 Mercedes-Benz E-Class Convertible20 mpg25 - 26 mpg22 mpg17.4 gal.348.00 / 435.00 mi.
2018 Porsche 911 Carrera Convertible19 - 20 mpg28 - 29 mpg22 - 23 mpg16.9 - 17.9 gal.338.00 / 490.10 - 340.10 / 501.20 mi.

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2017 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg29 mpg23 mpg18.5 gal.370.00 / 536.50 mi.
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)19 mpg28 mpg22 mpg18.5 gal.351.50 / 518.00 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg24 mpg19 mpg18.5 gal.314.50 / 444.00 mi.
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)15 mpg24 mpg18 mpg18.5 gal.277.50 / 444.00 mi.

2017 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2017 Mercedes-Benz E-Class Convertible17 - 20 mpg25 - 29 mpg20 - 23 mpg17.4 gal.-
2017 BMW 6 Series Convertible15 - 20 mpg24 - 29 mpg18 - 23 mpg18.5 gal.277.50 / 444.00 - 370.00 / 536.50 mi.
2017 Porsche 911 Carrera Convertible19 - 20 mpg29 mpg23 mpg16.9 gal.338.00 / 490.10 - 340.10 / 501.20 mi.

2016 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)15 mpg24 mpg18 mpg18.5 gal.277.50 / 444.00 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg25 mpg20 mpg18.5 gal.314.50 / 462.50 mi.
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)20 mpg29 mpg23 mpg18.5 gal.370.00 / 536.50 mi.
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg31 mpg24 mpg18.5 gal.370.00 / 573.50 mi.

2016 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2016 BMW 6 Series Convertible15 - 20 mpg24 - 31 mpg18 - 24 mpg18.5 gal.277.50 / 444.00 - 370.00 / 573.50 mi.
2016 Porsche 911 Carrera Convertible16 - 19 mpg26 - 27 mpg21 - 22 mpg16.9 - 18 gal.321.10 / 456.30 - 342.00 / 468.00 mi.
2016 Mercedes-Benz E-Class Convertible17 - 20 mpg26 - 29 mpg20 - 24 mpg17.4 gal.295.80 / 452.40 - 348.00 / 504.60 mi.

2015 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)16 mpg24 mpg20 mpg18.5 gal.296.0/444.0 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg25 mpg21 mpg18.5 gal.314.50 / 462.50 mi.
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)20 mpg29 mpg24 mpg18.5 gal.370.0/536.5 mi.
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg31 mpg25 mpg18.5 gal.370.00 / 573.50 mi.

2015 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2015 BMW 6 Series Convertible16 - 20 mpg24 - 31 mpg20 - 25 mpg18.5 gal.296.0/444.0 - 370.00 / 573.50 mi.
2015 Porsche 911 Carrera Convertible19 mpg26 - 27 mpg22 - 23 mpg16.9 - 18 gal.-
2015 Mercedes-Benz E-Class Convertible17 - 20 mpg26 - 29 mpg21 - 24 mpg17.4 gal.295.80 / 452.40 - 348.00 / 504.60 mi.

2014 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)16 mpg24 mpg20 mpg18.5 gal.296.0/444.0 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg25 mpg21 mpg18.5 gal.-
640i xDrive 2dr Convertible AWD (3.0L 6cyl Turbo 8A)20 mpg29 mpg24 mpg18.5 gal.370.0/536.5 mi.
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg30 mpg25 mpg18.5 gal.370.0/555.0 mi.

2014 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2014 Mercedes-Benz E-Class Convertible17 - 19 mpg26 - 28 mpg21 - 23 mpg17.4 gal.295.80 / 452.40 - 330.60 / 487.20 mi.
2014 BMW 6 Series Convertible16 - 20 mpg24 - 30 mpg20 - 25 mpg18.5 gal.296.0/444.0 - 370.0/555.0 mi.
2014 Jaguar XK Convertible16 mpg22 mpg19 mpg16.1 gal.257.60 / 354.20 mi.

2013 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)16 mpg24 mpg20 mpg18.5 gal.296.0/444.0 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 8A)17 mpg25 mpg21 mpg18.5 gal.314.50 / 462.50 mi.
640i 2dr Convertible (3.0L 6cyl Turbo 8A)20 mpg30 mpg25 mpg18.5 gal.370.0/555.0 mi.

2013 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2013 Mercedes-Benz E-Class Convertible16 - 19 mpg25 - 28 mpg20 - 23 mpg17.4 gal.278.40 / 435.00 - 330.60 / 487.20 mi.
2013 BMW 6 Series Convertible16 - 20 mpg24 - 30 mpg20 - 25 mpg18.5 gal.296.0/444.0 - 370.0/555.0 mi.
2013 Jaguar XK Convertible16 mpg22 mpg19 mpg16.1 gal.257.60 / 354.20 mi.

2012 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
650i xDrive 2dr Convertible AWD (4.4L 8cyl Turbo 8A)15 mpg19 mpg17 mpg18.5 gal.277.50 / 425.50 mi.
650i 2dr Convertible (4.4L 8cyl Turbo 6M)15 mpg22 mpg18 mpg18.5 gal.277.50 / 407.00 mi.
640i 2dr Convertible (3.0L 6cyl Turbo 8A)21 mpg31 mpg26 mpg18.5 gal.388.50 / 573.50 mi.

2012 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank CapacityRange in Miles
2012 BMW 6 Series Convertible15 - 21 mpg19 - 31 mpg17 - 26 mpg18.5 gal.277.50 / 407.00 - 388.50 / 573.50 mi.
2012 Jaguar XK Convertible16 mpg22 mpg19 mpg16.1 gal.257.60 / 354.20 mi.
2012 Chevrolet Corvette Convertible16 mpg26 mpg19 - 21 mpg18 gal.288.0/468.0 mi.
2012 Porsche 718 Boxster19 mpg26 - 27 mpg22 - 23 mpg14.3 - 16.9 gal.321.10 / 439.40 mi.
2012 Mercedes-Benz SLK-Class16 - 22 mpg29 - 32 mpg24 - 27 mpg18.5 gal.370.0/536.5 mi.

2010 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
650 i 2dr Convertible (4.8L 8cyl 6A)15 mpg23 mpg18 mpg18.5 gal.

2010 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
2010 BMW 6 Series Convertible15 mpg23 mpg18 mpg18.5 gal.

2009 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
650 i 2dr Convertible (4.8L 8cyl 6M)14 mpg21 mpg16 mpg18.5 gal.

2009 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
2009 BMW 6 Series Convertible14 mpg21 mpg16 mpg18.5 gal.

2008 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
650 i 2dr Convertible (4.8L 8cyl 6M)14 mpg21 mpg16 mpg18.5 gal.

2008 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
2008 BMW 6 Series Convertible14 mpg21 mpg16 mpg18.5 gal.

2007 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
650 i 2dr Convertible (4.8L 8cyl 6M)14 mpg21 mpg16 mpg18.5 gal.

2007 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
2007 BMW 6 Series Convertible14 mpg21 mpg16 mpg18.5 gal.

2005 BMW 6 Series Convertible MPG and Range

Trim NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
645 Ci 2dr Convertible (4.4L 8cyl 6M)13 mpg21 mpg16 mpg18.5 gal.

2005 BMW 6 Series Convertible vs. Competitor's MPG and Range

Car NameMPG CityMPG HighwayMPG CombinedFuel Tank Capacity
2005 BMW 6 Series Convertible13 mpg21 mpg16 mpg18.5 gal.

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