2021 Rolls-Royce Cullinan MPG & Specs — Real-World vs EPA, All Trims
Every gas trim of this model takes premium.
Is the 2021 Rolls-Royce Cullinan good on gas?
At up to 14 MPG combined, the 2021 Rolls-Royce Cullinan is worse than average for a Midsize Station Wagons — that class averages about 21.1 MPG across 609 EPA-tested versions, so it's on the thirsty side for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $4.68/gal for premium gas as of 2026-07-05 — the most efficient trim runs about $5,014/year (roughly $418/month, about $33.43 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 1,071 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2021 Rolls-Royce Cullinan trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 6.7L 12-cyl, S8 automatic, AWD | PREMIUM | 14 | $5,014 |
2021 Rolls-Royce Cullinan specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 6.7L 12-cyl turbo |
| Transmission | S8 automatic |
| Drive type | AWD |
| EPA body class | Midsize Station Wagons |
| Fuel | Premium |
| Tailpipe CO₂ | 618 g/mi |
| Gas guzzler tax | Yes — at least one trim carried the federal guzzler tax |
Other years of the Rolls-Royce Cullinan
Similar cars (Midsize Station Wagons)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
1 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.