2026 head-to-head · Midsize & Large SUV
2026 Aston Martin DBX 727 vs Rolls-Royce Cullinan
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
4WD · 4.0L 8-cyl turbo · 9-speed automatic · 16 MPG
AWD · 6.7L 12-cyl turbo · 8-speed automatic · 14 MPG
The 2026 Aston Martin DBX 727 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $3,703 a year to fuel (16 MPG), versus $4,232 for the 2026 Rolls-Royce Cullinan (14 MPG). That's roughly $529 a year, or about $2,645 over five years.
Your numbers
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Fuel cost over 10 years
- Aston Martin DBX 727
- Rolls-Royce Cullinan
Side by side
| Aston Martin DBX 727 | Rolls-Royce Cullinan | |
|---|---|---|
| $3,703 | Your annual fuel cost | $4,232 |
| 16 MPG | Combined efficiency | 14 MPG |
| 14 MPG | City | 12 MPG |
| 19 MPG | Highway | 19 MPG |
| 105 cu ft | Passenger volume | — |
| 29 cu ft | Cargo volume | — |
| 546 g/mi | Tailpipe CO₂ (g/mi) | 609 g/mi |
| 3/10 | EPA fuel economy score | 2/10 |
| 3/10 | EPA greenhouse gas score | 2/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 4.0L 8-cyl turbo | Engine / motor | 6.7L 12-cyl turbo |
| 9-speed automatic | Transmission | 8-speed automatic |
| 4WD | Drivetrain | AWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Aston Martin DBX 727 vs Rolls-Royce Cullinan across model years
- Aston Martin DBX 727
- Rolls-Royce Cullinan
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 91 2026 midsize & large SUVs, the Aston Martin DBX 727 ranks 90th and the Rolls-Royce Cullinan 91st for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2026 Aston Martin DBX 727 or the 2026 Rolls-Royce Cullinan?
Measured by cost to drive, the Aston Martin DBX 727. The Aston Martin DBX 727 is rated 16 MPG combined and the Rolls-Royce Cullinan 14 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2026 Aston Martin DBX 727 vs. the Rolls-Royce Cullinan per year?
At 15,000 miles a year with $3.95/gal premium gas, about $3,703 for the Aston Martin DBX 727 and $4,232 for the Rolls-Royce Cullinan.
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