Against 145 other V8 cars rated 2024–2026, the M850i beats their 16.5 mpg average by 2.5 mpg, about $306 a year.
Every BMW M850i engine, compared
The BMW M850i was rated in a single specification, so its gas mileage does not vary by version — only by model year. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 4.4L 8-cyl | 17 / 24.6 | 2019–2026 | $1,969 |
What that actually costs
Against its rivals in the same model years, the Bentley Continental gets 19 mpg, the Lexus LC 21.7 mpg and the Audi RS 5 20 mpg, next to 19 mpg for the 2026 M850i.
| Measure | Value |
|---|---|
| Cost per mile (2026) | $0.168 |
| Fuel per year | $2,021 |
| Fuel over five years | $10,105 |
| Against other V8 cars, 2024–2026 | −$306 a year |
| EPA's own estimate | $3,950 a year |
City or highway — who is this car for
The 2026 BMW M850i gives up 7 mpg in town: 24 on the highway against 17 in the city, $659 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2026) | 17 mpg | $2,259 a year if you only drive in town |
| Highway | 24 mpg | $1,600 a year if you mostly commute |
| Gap | +7 mpg (41%) | Wide — this car dislikes traffic |
How the M850i changed over the years
The M850i peaked in 2022 at 20 mpg (17 city, 25 highway) and was at its thirstiest in 2026 at 19 — 1 mpg apart, or $101 a year in fuel between buying one year and the other. The 2026 car does 19.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2026 | 17 / 24 | 1 | $2,021 | |
| 2025 | 17 / 24 | 1 | $2,021 | |
| 2024 | 17 / 24 | 1 | $2,021 | |
| 2023 | 17 / 24 | 1 | $2,021 | |
| 2022 | 17 / 25 | 1 | $1,920 | |
| 2021 | 17 / 25 | 1 | $1,920 | |
| 2020 | 17 / 25 | 1 | $1,920 | |
| 2019 | 17 / 26 | 1 | $1,920 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 8 EPA ratings of the BMW M850i — 1 engine across 2019–2026. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,950. Full method.
Frequently asked questions
What mpg does the 2026 BMW M850i get?
19 mpg combined, 17 city and 24 highway, per EPA. Across every year since 2019 the M850i has averaged 19.5 mpg.
Is the 2026 M850i more efficient than the 2025?
About the same: 19 against 19 mpg combined.
Which M850i year has the best gas mileage?
The 2022, at 20 mpg combined (17 city, 25 highway).
Does the M850i get better gas mileage than the Bentley Continental?
About the same: 19 mpg for the 2026 M850i against 19 for the 2026 Bentley Continental.
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