2015 head-to-head · Midsize Car
2015 Audi A6 Diesel vs Cadillac CTS
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 · 29 MPG
On fuel costs these two are nearly tied. Driving 15,000 miles a year with $3.70/gal diesel fuel and $3.10/gal regular gas, the most efficient 2015 Audi A6 Diesel (29 MPG) costs about $1,914 a year to fuel and the 2015 Cadillac CTS (24 MPG) about $1,938.
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 Diesel
- Cadillac CTS
Side by side
| Audi A6 Diesel | Cadillac CTS | |
|---|---|---|
| $1,914 | Your annual fuel cost | $1,938 |
| 29 MPG | Combined efficiency | 24 MPG |
| 24 MPG | City | 20 MPG |
| 38 MPG | Highway | 30 MPG |
| 98 cu ft | Passenger volume | 97 cu ft |
| 16 cu ft | Cargo volume | 13 cu ft |
| 349 g/mi | Tailpipe CO₂ (g/mi) | 374 g/mi |
| 7/10 | EPA fuel economy score | 6/10 |
| 6/10 | EPA greenhouse gas score | 6/10 |
| Diesel | Powertrain | Gas |
| Diesel | Fuel | Regular gasoline |
| 3.0L 6-cyl turbo | Engine / motor | 2.0L 4-cyl turbo |
| 8-speed automatic | Transmission | 6-speed automatic |
| AWD | Drivetrain | RWD |
✓ 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 Diesel vs Cadillac CTS across model years
- Audi A6 Diesel
- Cadillac CTS
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 Diesel has more cargo space (16 vs. 13 cu ft).
Among 69 2015 midsize cars, the Audi A6 Diesel ranks 38th and the Cadillac CTS 43rd for lowest fuel cost.
The powertrains differ: the Audi A6 Diesel is a diesel, while the Cadillac CTS is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2015 Audi A6 Diesel or the 2015 Cadillac CTS?
Measured by cost to drive, the Audi A6 Diesel. The Audi A6 Diesel is rated 29 MPG combined and the Cadillac CTS 24 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Audi A6 Diesel vs. the Cadillac CTS per year?
At 15,000 miles a year with $3.70/gal diesel fuel and $3.10/gal regular gas, about $1,914 for the Audi A6 Diesel and $1,938 for the Cadillac CTS.
Which has more cargo space?
The Audi A6 Diesel, with 16 cu ft of luggage volume versus 13 cu ft (EPA interior volume index).
Audi A6 Diesel vs Cadillac CTS in other years
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