2018 BMW 640i ConvertibleFuel Economy & MPG Ratings
Gasoline Subcompact CarsRear-Wheel Drive
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City
20
MPG
Highway
29
MPG
Combined
23
MPG
Trim Comparison
Automatic (S8)
Premium
City
20
Hwy
29
Comb
23
Fuel cost: $3,550/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic (S8) | Premium | 20 | 29 | 23 | $3,550 |
Annual Fuel Cost
$3,550
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-5,750
vs. average new vehicle
EPA Fuel Economy Score: 5/10
GHG Score: 5/10
Environment
- CO₂ Tailpipe Emissions
- 378 g/mile
- Annual Petroleum Consumption
- 12.9 barrels
Specifications
- Engine
- 3L 6-cyl
- Transmission
- 8-speed Automatic
- Drivetrain
- RWD
- Body Style
- Sedan
- GVWR
- Class 1 (≤6,000 lbs)
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 3L, 6-cylinder
- Induction Type
- Direct Injection
- Efficiency Tech
- Auto Start-Stop
- Fuel Type
- Premium Gasoline
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$2,928/yr
California
$5.957/gal$3,885/yr
Texas
$3.888/gal$2,536/yr
Florida
$4.136/gal$2,697/yr
New York
$4.522/gal$2,949/yr
Ohio
$4.510/gal$2,941/yr
Washington
$5.591/gal$3,646/yr
Colorado
$4.618/gal$3,012/yr
Minnesota
$4.344/gal$2,833/yr
Massachusetts
$4.448/gal$2,901/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $2,928/yr | — |
| California | $5.957/gal | $3,885/yrHIGHEST | +$957 |
| Texas | $3.888/gal | $2,536/yrLOWEST | $-392 |
| Florida | $4.136/gal | $2,697/yr | $-231 |
| New York | $4.522/gal | $2,949/yr | +$21 |
| Ohio | $4.510/gal | $2,941/yr | +$13 |
| Washington | $5.591/gal | $3,646/yr | +$718 |
| Colorado | $4.618/gal | $3,012/yr | +$84 |
| Minnesota | $4.344/gal | $2,833/yr | $-95 |
| Massachusetts | $4.448/gal | $2,901/yr | $-27 |
Calculated at 15,000 miles/year (EPA standard assumption) using 23 MPG combined. Regular gasoline prices. Actual costs vary.
Related
BMW 640i Convertible MPG History
See how this model's fuel economy changed by year