2015 head-to-head · Large Car
2015 Audi A8 Diesel vs Cadillac XTS
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 · 28 MPG
The 2015 Audi A8 Diesel is the cheaper one to run. Driving 15,000 miles a year with $3.70/gal diesel fuel and $3.10/gal regular gas, it costs about $1,982 a year to fuel (28 MPG), versus $2,214 for the 2015 Cadillac XTS (21 MPG). That's roughly $232 a year, or about $1,161 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 A8 Diesel
- Cadillac XTS
Side by side
| Audi A8 Diesel | Cadillac XTS | |
|---|---|---|
| $1,982 | Your annual fuel cost | $2,214 |
| 28 MPG | Combined efficiency | 21 MPG |
| 24 MPG | City | 18 MPG |
| 36 MPG | Highway | 28 MPG |
| 107 cu ft | Passenger volume | 104 cu ft |
| 15 cu ft | Cargo volume | 18 cu ft |
| 360 g/mi | Tailpipe CO₂ (g/mi) | 419 g/mi |
| 7/10 | EPA fuel economy score | 5/10 |
| 6/10 | EPA greenhouse gas score | 5/10 |
| Diesel | Powertrain | Gas |
| Diesel | Fuel | Regular gasoline |
| 3.0L 6-cyl turbo | Engine / motor | 3.6L 6-cyl |
| 8-speed automatic | Transmission | 6-speed automatic |
| AWD | Drivetrain | FWD |
✓ 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 A8 Diesel vs Cadillac XTS across model years
- Audi A8 Diesel
- Cadillac XTS
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 Cadillac XTS has more cargo space (18 vs. 15 cu ft).
Among 29 2015 large cars, the Audi A8 Diesel ranks 6th and the Cadillac XTS 16th for lowest fuel cost.
The powertrains differ: the Audi A8 Diesel is a diesel, while the Cadillac XTS is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2015 Audi A8 Diesel or the 2015 Cadillac XTS?
Measured by cost to drive, the Audi A8 Diesel. The Audi A8 Diesel is rated 28 MPG combined and the Cadillac XTS 21 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Audi A8 Diesel vs. the Cadillac XTS per year?
At 15,000 miles a year with $3.70/gal diesel fuel and $3.10/gal regular gas, about $1,982 for the Audi A8 Diesel and $2,214 for the Cadillac XTS.
Which has more cargo space?
The Cadillac XTS, with 18 cu ft of luggage volume versus 15 cu ft (EPA interior volume index).
Audi A8 Diesel vs Cadillac XTS in other years
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