2004 BMW 645ci Convertible MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2004 BMW 645ci Convertible.

The 2004 BMW 645ci Convertible has 3 model options: Manual 6-spd 8-cyl, 4.4 L, Automatic (S6) 8-cyl, 4.4 L and Automatic (S6) 8-cyl, 4.4 L.

The 2004 BMW 645ci Convertible Manual 6-spd 8-cyl, 4.4 L runs on premium gasoline and is in the Subcompact Cars car class.

The 2004 BMW 645ci Convertible Automatic (S6) 8-cyl, 4.4 L runs on premium gasoline and is in the Subcompact Cars car class.

The 2004 BMW 645ci Convertible Automatic (S6) 8-cyl, 4.4 L runs on premium gasoline and is in the Subcompact Cars car class.

🛣 How Many Miles per Gallon (MPG) Does a 2004 BMW 645ci Convertible Get?

Across all models, the combined average MPG for the 2004 BMW 645ci Convertible is 17 miles per gallon.

The table below breaks down the MPG for each model option:

Model Option Combined MPG City MPG Highway MPG
Manual 6-spd 8-cyl, 4.4 L 16 13 21
Automatic (S6) 8-cyl, 4.4 L 19 16 24
Automatic (S6) 8-cyl, 4.4 L 16 13 21

💵 What is the Average Yearly Fuel Cost for a 2004 BMW 645ci Convertible?

The average fuel costs for all models of the 2004 BMW 645ci Convertible is $4,367.

The average fuel costs have been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.

Comparing a 2004 BMW 645ci Convertible to an average vehicle over 5 years, you will spend $10,333 more on fuel.

The table below shows the fuel costs and 5-year save/spend for each model option:

Model Option Fuel Cost 5-Year Save/Spend
Manual 6-spd 8-cyl, 4.4 L $4,600 spend $11,500 more
Automatic (S6) 8-cyl, 4.4 L $3,900 spend $8,000 more
Automatic (S6) 8-cyl, 4.4 L $4,600 spend $11,500 more

The 2004 BMW 645ci Convertible is also subject to the Gas Guzzler Tax, which is a federal tax on vehicles that has a combined MPG of less than 22.5.

The tables below show how much you can expect to pay in Gas Guzzler taxes.

Model Option Gas Guzzler Tax
Manual 6-spd 8-cyl, 4.4 L $3,700
Model Option Gas Guzzler Tax
Automatic (S6) 8-cyl, 4.4 L $3,700

🛢 How Many Barrels of Petroleum Does a 2004 BMW 645ci Convertible Consume?

Across all models, the average number barrels of petroleum that the 2004 BMW 645ci Convertible will consume in one year is 18 barrels.

The majority of the world's petroleum is sourced from countries like Saudi Arabia, Russia, Iraq, and the United States.

Model Option Barrels
Manual 6-spd 8-cyl, 4.4 L 19
Automatic (S6) 8-cyl, 4.4 L 16
Automatic (S6) 8-cyl, 4.4 L 19

Overview

The tables below cover all of the miles per gallon, engine specifications, and emission details we have for the 3 2004 BMW 645ci Convertible model options.

Manual 6-spd 8-cyl, 4.4 L

The table below contains all of the details we have for the 2004 BMW 645ci Convertible Manual 6-spd 8-cyl, 4.4 L:

City MPG 13
Highway MPG 21
Combined MPG 16
Save/Spend vs Average Car Spend $11,500
Gas Guzzler Tax $7,700
Fuel Cost $4,600
Fuel Type 1 Premium
Barrels of Petroleum 19
Drive Rear-Wheel Drive
Cylinders 8
Transmission Manual 6-spd
Vehicle Class Subcompact Cars
Start/Stop? No
Supercharged? No
Turbocharged? No

Automatic (S6) 8-cyl, 4.4 L

The table below contains all of the details we have for the 2004 BMW 645ci Convertible Automatic (S6) 8-cyl, 4.4 L:

City MPG 16
Highway MPG 24
Combined MPG 19
Save/Spend vs Average Car Spend $8,000
Fuel Cost $3,900
Fuel Type 1 Premium
Barrels of Petroleum 16
Drive Rear-Wheel Drive
Cylinders 8
Transmission Automatic (S6)
Vehicle Class Subcompact Cars
Start/Stop? No
Supercharged? No
Turbocharged? No

Automatic (S6) 8-cyl, 4.4 L

The table below contains all of the details we have for the 2004 BMW 645ci Convertible Automatic (S6) 8-cyl, 4.4 L:

City MPG 13
Highway MPG 21
Combined MPG 16
Save/Spend vs Average Car Spend $11,500
Gas Guzzler Tax $7,700
Fuel Cost $4,600
Fuel Type 1 Premium
Barrels of Petroleum 19
Drive Rear-Wheel Drive
Cylinders 8
Transmission Automatic (S6)
Vehicle Class Subcompact Cars
Start/Stop? No
Supercharged? No
Turbocharged? No

Disclaimer

Ratings were provided by the manufacturer to the U.S. Department of Energy, which is where we sourced the data. Be advised that manufacturers may have upgraded, downgraded, or changed these ratings following the compilation of this data.

MPG Buddy does not guarantee the accuracy of this data, nor are we liable for any decisions made by referencing this data. Make sure to contact the specific car manufacturer to confirm accuracy.

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  • "2004 BMW 645ci Convertible MPG and Fuel Economy". MPG Buddy. Accessed on June 25, 2022. http://mpgbuddy.com/cars/bmw/645ci-convertible/2004.

  • "2004 BMW 645ci Convertible MPG and Fuel Economy". MPG Buddy, http://mpgbuddy.com/cars/bmw/645ci-convertible/2004. Accessed 25 June, 2022

  • 2004 BMW 645ci Convertible MPG and Fuel Economy. MPG Buddy. Retrieved from http://mpgbuddy.com/cars/bmw/645ci-convertible/2004.