2015 head-to-head · Large Car
2015 Cadillac XTS vs Porsche Panamera Plug-in Hybrid
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
RWD · 3.0L 6-cyl supercharged · 8-speed dual-clutch · 50 MPGe + 25 MPG
The 2015 Porsche Panamera Plug-in Hybrid is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas, 18¢/kWh electricity and $3.95/gal premium gas, it costs about $1,996 a year to fuel (50 MPGe + 25 MPG), versus $2,214 for the 2015 Cadillac XTS (21 MPG). That's roughly $218 a year, or about $1,091 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
- Cadillac XTS
- Porsche Panamera Plug-in Hybrid
Side by side
| Cadillac XTS | Porsche Panamera Plug-in Hybrid | |
|---|---|---|
| $2,214 | Your annual fuel cost | $1,996 |
| 21 MPG | Combined efficiency | 50 MPGe + 25 MPG |
| 18 MPG | City | 42 MPGe / 23 MPG |
| 28 MPG | Highway | 66 MPGe / 29 MPG |
| — | Electricity use (kWh/100 mi) | 52 kWh |
| — | Driving range | 540 mi |
| — | All-electric range | 16 mi |
| 104 cu ft | Passenger volume | 108 cu ft |
| 18 cu ft | Cargo volume | 16 cu ft |
| 419 g/mi | Tailpipe CO₂ (g/mi) | 229 g/mi |
| 5/10 | EPA fuel economy score | 8/10 |
| 5/10 | EPA greenhouse gas score | 9/10 |
| — | Charge time at 240V | 3 hrs |
| Gas | Powertrain | Plug-in hybrid |
| Regular gasoline | Fuel | Premium gas + electricity |
| 3.6L 6-cyl | Engine / motor | 3.0L 6-cyl supercharged |
| 6-speed automatic | Transmission | 8-speed dual-clutch |
| FWD | 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.
Cadillac XTS vs Porsche Panamera Plug-in Hybrid across model years
- Cadillac XTS
- Porsche Panamera Plug-in Hybrid
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 Porsche Panamera Plug-in Hybrid has more passenger space (108 vs. 104 cu ft); the Cadillac XTS has more cargo space (18 vs. 16 cu ft).
Among 29 2015 large cars, the Cadillac XTS ranks 16th and the Porsche Panamera Plug-in Hybrid 7th for lowest fuel cost.
The powertrains differ: the Cadillac XTS is a conventional gas model, while the Porsche Panamera Plug-in Hybrid is a plug-in hybrid.
Frequently asked questions
Which is more fuel-efficient, the 2015 Cadillac XTS or the 2015 Porsche Panamera Plug-in Hybrid?
Measured by cost to drive, the Porsche Panamera Plug-in Hybrid. The Cadillac XTS is rated 21 MPG combined and the Porsche Panamera Plug-in Hybrid 50 MPGe + 25 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Cadillac XTS vs. the Porsche Panamera Plug-in Hybrid per year?
At 15,000 miles a year with $3.10/gal regular gas, 18¢/kWh electricity and $3.95/gal premium gas, about $2,214 for the Cadillac XTS and $1,996 for the Porsche Panamera Plug-in Hybrid.
Which has more cargo space?
The Cadillac XTS, with 18 cu ft of luggage volume versus 16 cu ft (EPA interior volume index).
Cadillac XTS vs Porsche Panamera Plug-in Hybrid in other years
More 2015 comparisons
Cadillac XTS vs…
Porsche Panamera Plug-in Hybrid vs…
Or compare the 2015 Cadillac XTS with anything else: