2020 head-to-head · Large Car
2020 Audi A8 Plug-in Hybrid vs Cadillac CT6
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 · 54 MPGe + 23 MPG
On fuel costs these two are nearly tied. Driving 15,000 miles a year with 18¢/kWh electricity, $3.95/gal premium gas and $3.10/gal regular gas, the most efficient 2020 Audi A8 Plug-in Hybrid (54 MPGe + 23 MPG) costs about $2,174 a year to fuel and the 2020 Cadillac CT6 (21 MPG) about $2,214.
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 Plug-in Hybrid
- Cadillac CT6
Side by side
| Audi A8 Plug-in Hybrid | Cadillac CT6 | |
|---|---|---|
| $2,174 | Your annual fuel cost | $2,214 |
| 54 MPGe + 23 MPG | Combined efficiency | 21 MPG |
| 49 MPGe / 21 MPG | City | 18 MPG |
| 61 MPGe / 27 MPG | Highway | 27 MPG |
| 63 kWh | Electricity use (kWh/100 mi) | — |
| 420 mi | Driving range | — |
| 17 mi | All-electric range | — |
| 111 cu ft | Passenger volume | 110 cu ft |
| 13 cu ft | Cargo volume | 15 cu ft |
| 213 g/mi | Tailpipe CO₂ (g/mi) | 420 g/mi |
| 7/10 | EPA fuel economy score | 4/10 |
| 9/10 | EPA greenhouse gas score | 4/10 |
| 2.4 hrs | Charge time at 240V | — |
| Plug-in hybrid | Powertrain | Gas |
| Premium gas + electricity | Fuel | Regular gasoline |
| 3.0L 6-cyl turbo | Engine / motor | 3.6L 6-cyl |
| 8-speed automatic | Transmission | 10-speed automatic |
| AWD | 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 A8 Plug-in Hybrid vs Cadillac CT6 across model years
- Audi A8 Plug-in Hybrid
- Cadillac CT6
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 CT6 has more cargo space (15 vs. 13 cu ft).
Among 32 2020 large cars, the Audi A8 Plug-in Hybrid ranks 15th and the Cadillac CT6 18th for lowest fuel cost.
The powertrains differ: the Audi A8 Plug-in Hybrid is a plug-in hybrid, while the Cadillac CT6 is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2020 Audi A8 Plug-in Hybrid or the 2020 Cadillac CT6?
Measured by cost to drive, the Audi A8 Plug-in Hybrid. The Audi A8 Plug-in Hybrid is rated 54 MPGe + 23 MPG combined and the Cadillac CT6 21 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2020 Audi A8 Plug-in Hybrid vs. the Cadillac CT6 per year?
At 15,000 miles a year with 18¢/kWh electricity, $3.95/gal premium gas and $3.10/gal regular gas, about $2,174 for the Audi A8 Plug-in Hybrid and $2,214 for the Cadillac CT6.
Which has more cargo space?
The Cadillac CT6, with 15 cu ft of luggage volume versus 13 cu ft (EPA interior volume index).
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