Against 145 other V8 cars rated 2024–2026, the DBX sits right on their 16.5 mpg average.
Every Aston Martin DBX engine, compared
The Aston Martin DBX 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 |
|---|---|---|---|---|
| 4L 8-cyl | 14.2 / 19.5 | 2021–2026 | $2,400 |
What that actually costs
Against its rivals in the same model years, the Land Rover Defender gets 18.3 mpg and the Lexus TX 25.5 mpg, next to 16 mpg for the 2026 DBX. The DBX costs the most of them to run: $894 a year more than the Lexus TX.
| Measure | Value |
|---|---|
| Cost per mile (2026) | $0.200 |
| Fuel per year | $2,400 |
| Fuel over five years | $12,000 |
| Against other V8 cars, 2024–2026 | +$73 a year |
| EPA's own estimate | $4,850 a year |
City or highway — who is this car for
The 2026 Aston Martin DBX gives up 5 mpg in town: 19 on the highway against 14 in the city, $722 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2026) | 14 mpg | $2,743 a year if you only drive in town |
| Highway | 19 mpg | $2,021 a year if you mostly commute |
| Gap | +5 mpg (36%) | Wide — this car dislikes traffic |
How the DBX changed over the years
The DBX peaked in 2025 at 17 mpg (15 city, 20 highway) and was at its thirstiest in 2021 at 15 — 2 mpg apart, or $301 a year in fuel between buying one year and the other. The 2026 car does 16.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2026 | 14 / 19 | 1 | $2,400 | |
| 2025 | 15 / 20 | 1 | $2,259 | |
| 2024 | 14 / 20 | 1 | $2,400 | |
| 2023 | 14 / 20 | 1 | $2,400 | |
| 2022 | 14 / 20 | 1 | $2,400 | |
| 2021 | 14 / 18 | 1 | $2,560 |
MPG is a number. Dollars per year is the answer.
- Fuel profile built from your actual mileage and local prices
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- Insurance and fuel folded into 5-year cost to own
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How we count
This page rests on 6 EPA ratings of the Aston Martin DBX — 1 engine across 2021–2026. 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 $4,850. Full method.
Frequently asked questions
What mpg does the 2026 Aston Martin DBX get?
16 mpg combined, 14 city and 19 highway, per EPA. Across every year since 2021 the DBX has averaged 16 mpg.
Is the 2026 DBX more efficient than the 2025?
No: 16 against 17 mpg combined, about $141 a year more to run.
Which DBX year has the best gas mileage?
The 2025, at 17 mpg combined (15 city, 20 highway).
Does the DBX get better gas mileage than the Land Rover Defender?
No: 16 mpg for the 2026 DBX against 18.3 for the 2026 Land Rover Defender, about $302 a year more to run.
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