2020 BMW 840i xDrive Gran Coupe MPG & Specs — Real-World vs EPA, All Trims
Every gas trim of this model takes premium.
Is the 2020 BMW 840i xDrive Gran Coupe good on gas?
At up to 23 MPG combined, the 2020 BMW 840i xDrive Gran Coupe is about average for a Midsize Cars — that class averages about 23.0 MPG across 5,710 EPA-tested versions, so it's middle-of-the-road 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 $3,052/year (roughly $254/month, about $20.35 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 652 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 →
2020 BMW 840i xDrive Gran Coupe trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 3.0L 6-cyl, S8 automatic, AWD | PREMIUM | 23 | $3,052 |
2020 BMW 840i xDrive Gran Coupe 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 | 3.0L 6-cyl turbo |
| Transmission | S8 automatic |
| Drive type | AWD |
| EPA body class | Midsize Cars |
| Fuel | Premium |
| Tailpipe CO₂ | 388 g/mi |
Other years of the BMW 840i xDrive Gran Coupe
Similar cars (Midsize Cars)
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.