2018 BMW 6 Series EPA Fuel Economy Summary

The 2018 BMW 6 Series delivers an EPA-certified 19–23 MPG combined (16–20 city / 25–29 highway depending on engine and drivetrain) across 10 configurations. Estimated annual fuel costs range from $3,300 to $4,000.

Combined MPG
19–23 MPG
55% city / 45% highway weighted
City MPG
16–20 MPG
Stop-and-go urban cycle
Highway MPG
25–29 MPG
Sustained open-highway test
Annual Fuel Cost
$3,300–4,000
EPA estimate @ 15,000 miles/yr

Official EPA Fuel Economy Ratings by Configuration (10 Variants)

Laboratory certification test values across engine, transmission, and drivetrain permutations

Configuration / Model Powertrain Drivetrain Transmission City Highway Combined Annual Fuel Cost CO2 (g/mi)
640i Convertible Premium 3L 6-Cyl Gas Rear-Wheel Drive Automatic (S8) 20 MPG 29 MPG 23 MPG $3,300 —
640i Gran Coupe Premium 3L 6-Cyl Gas Rear-Wheel Drive Automatic (S8) 20 MPG 29 MPG 23 MPG $3,300 —
640i xDrive Gran Turismo Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 20 MPG 28 MPG 23 MPG $3,300 —
640i xDrive Convertible Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 19 MPG 28 MPG 22 MPG $3,450 —
640i xDrive Gran Coupe Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 19 MPG 28 MPG 22 MPG $3,450 —
650i Convertible Premium 4.4L 8-Cyl Gas Rear-Wheel Drive Automatic (S8) 17 MPG 25 MPG 20 MPG $3,800 —
650i Gran Coupe Premium 4.4L 8-Cyl Gas Rear-Wheel Drive Automatic (S8) 17 MPG 25 MPG 20 MPG $3,800 —
650i xDrive Convertible Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 16 MPG 25 MPG 19 MPG $4,000 —
650i xDrive Gran Coupe Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 16 MPG 25 MPG 19 MPG $4,000 —
Alpina B6 xDrive Gran Coupe Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 16 MPG 25 MPG 19 MPG $4,000 —
EPA Test Methodology: Fuel economy estimates are determined by vehicle manufacturers in accordance with EPA regulations (40 CFR Part 600) and verified by EPA laboratories. Estimates assume 15,000 miles per year of driving (55% city, 45% highway) at prevailing fuel and electricity prices.

Deterministic Fuel Cost & Consumption Benchmarks

Standardized annual energy consumption and operating cost metrics based on 15,000 annual miles

Fuel Cost per 25 Miles

$3.80–$4.61

Based on $3.50 per gallon regular gasoline

Annual Fuel Consumption

652–789 Gallons

Estimated annual energy units needed for 15,000 miles

5-Year Fuel Cost vs Avg Vehicle

Official EPA Benchmark

Compared to the average new vehicle over 5 years

Related Official Reports for 2018 BMW 6 Series

Cross-reference safety ratings, owner defect complaints, and recall campaigns

Official US Government Data Provenance

Fuel economy ratings, electric range figures, and energy cost estimates on this page are retrieved directly from the United States Environmental Protection Agency (EPA) and U.S. Department of Energy (FuelEconomy.gov) certified vehicle database.

Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.