2021 BMW 8 Series EPA Fuel Economy Summary

The 2021 BMW 8 Series delivers an EPA-certified 19–25 MPG combined (17–23 city / 24–30 highway depending on engine and drivetrain) across 9 configurations. Estimated annual fuel costs range from $3,050 to $4,000.

Combined MPG
19–25 MPG
55% city / 45% highway weighted
City MPG
17–23 MPG
Stop-and-go urban cycle
Highway MPG
24–30 MPG
Sustained open-highway test
Annual Fuel Cost
$3,050–4,000
EPA estimate @ 15,000 miles/yr

Official EPA Fuel Economy Ratings by Configuration (9 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)
840i Coupe Premium 3L 6-Cyl Gas Rear-Wheel Drive Automatic (S8) 23 MPG 30 MPG 25 MPG $3,050 —
840i Convertible Premium 3L 6-Cyl Gas Rear-Wheel Drive Automatic (S8) 22 MPG 29 MPG 25 MPG $3,050 —
840i Gran Coupe Premium 3L 6-Cyl Gas Rear-Wheel Drive Automatic (S8) 22 MPG 29 MPG 25 MPG $3,050 —
840i xDrive Coupe Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 20 MPG 27 MPG 23 MPG $3,300 —
840i xDrive Convertible Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 20 MPG 27 MPG 23 MPG $3,300 —
840i xDrive Gran Coupe Premium 3L 6-Cyl Gas All-Wheel Drive Automatic (S8) 20 MPG 27 MPG 23 MPG $3,300 —
M850i xDrive Coupe Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 17 MPG 25 MPG 20 MPG $3,800 —
M850i xDrive Convertible Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 17 MPG 24 MPG 19 MPG $4,000 —
M850i xDrive Gran Coupe Premium 4.4L 8-Cyl Gas All-Wheel Drive Automatic (S8) 17 MPG 24 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

$3.50–$4.61

Based on $3.50 per gallon regular gasoline

Annual Fuel Consumption

600–789 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 2021 BMW 8 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.