2018 head-to-head · Midsize Car
2018 Audi A6 vs BMW 5 Series Diesel
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
AWD · 3.0L 6-cyl turbo · 8-speed automatic · 30 MPG
The 2018 BMW 5 Series Diesel is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas and $3.70/gal diesel fuel, it costs about $1,850 a year to fuel (30 MPG), versus $2,116 for the 2018 Audi A6 (28 MPG). That's roughly $266 a year, or about $1,330 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Audi A6
- BMW 5 Series Diesel
Side by side
| Audi A6 | BMW 5 Series Diesel | |
|---|---|---|
| $2,116 | Your annual fuel cost | $1,850 |
| 28 MPG | Combined efficiency | 30 MPG |
| 25 MPG | City | 26 MPG |
| 34 MPG | Highway | 36 MPG |
| 98 cu ft | Passenger volume | 99 cu ft |
| 16 cu ft | Cargo volume | 14 cu ft |
| 311 g/mi | Tailpipe CO₂ (g/mi) | 341 g/mi |
| 6/10 | EPA fuel economy score | 7/10 |
| 6/10 | EPA greenhouse gas score | 5/10 |
| Gas | Powertrain | Diesel |
| Premium gasoline | Fuel | Diesel |
| 2.0L 4-cyl turbo | Engine / motor | 3.0L 6-cyl turbo |
| 7-speed dual-clutch | Transmission | 8-speed automatic |
| FWD | 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.
Audi A6 vs BMW 5 Series Diesel across model years
- Audi A6
- BMW 5 Series Diesel
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
Per EPA interior volume figures, the Audi A6 has more cargo space (16 vs. 14 cu ft).
Among 74 2018 midsize cars, the Audi A6 ranks 47th and the BMW 5 Series Diesel 36th for lowest fuel cost.
The powertrains differ: the Audi A6 is a conventional gas model, while the BMW 5 Series Diesel is a diesel.
Frequently asked questions
Which is more fuel-efficient, the 2018 Audi A6 or the 2018 BMW 5 Series Diesel?
Measured by cost to drive, the BMW 5 Series Diesel. The Audi A6 is rated 28 MPG combined and the BMW 5 Series Diesel 30 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2018 Audi A6 vs. the BMW 5 Series Diesel per year?
At 15,000 miles a year with $3.95/gal premium gas and $3.70/gal diesel fuel, about $2,116 for the Audi A6 and $1,850 for the BMW 5 Series Diesel.
Which has more cargo space?
The Audi A6, with 16 cu ft of luggage volume versus 14 cu ft (EPA interior volume index).
More 2018 comparisons
Audi A6 vs…
Or compare the 2018 Audi A6 with anything else: