2019 head-to-head · Large Car

2019 Cadillac CT6 vs Mercedes-Benz S-Class 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.

Swap sides
✓ Cheaper to run
2019 Cadillac CT6Gas
$2,116/ year to fuel
28 MPG
✓ Cheaper to run
2019 Mercedes-Benz S-Class Plug-in HybridPlug-in hybrid
$2,018/ year to fuel
64 MPGe + 23 MPG

RWD · 3.0L 4-cyl turbo · 9-speed automatic · 64 MPGe + 23 MPG

The 2019 Mercedes-Benz S-Class Plug-in Hybrid is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas and 18¢/kWh electricity, it costs about $2,018 a year to fuel (64 MPGe + 23 MPG), versus $2,116 for the 2019 Cadillac CT6 (28 MPG). That's roughly $98 a year, or about $488 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 CT6
  • Mercedes-Benz S-Class Plug-in Hybrid

Side by side

Cadillac CT6Mercedes-Benz S-Class Plug-in Hybrid
$2,116 Your annual fuel cost $2,018
28 MPG Combined efficiency 64 MPGe + 23 MPG
24 MPG City 58 MPGe / 21 MPG
34 MPG Highway 73 MPGe / 26 MPG
— Electricity use (kWh/100 mi) 53 kWh
— Driving range 510 mi
— All-electric range 19 mi
110 cu ft Passenger volume 112 cu ft
15 cu ft Cargo volume 9 cu ft
317 g/mi Tailpipe CO₂ (g/mi) 205 g/mi
6/10 EPA fuel economy score 8/10
6/10 EPA greenhouse gas score 9/10
— Charge time at 240V 1.3 hrs
Gas Powertrain Plug-in hybrid
Premium gasoline Fuel Premium gas + electricity
2.0L 4-cyl turbo Engine / motor 3.0L 4-cyl turbo
10-speed automatic Transmission 9-speed automatic
RWD 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 CT6 vs Mercedes-Benz S-Class Plug-in Hybrid across model years

  • Cadillac CT6
  • Mercedes-Benz S-Class 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 Cadillac CT6 has more cargo space (15 vs. 9 cu ft).

Among 30 2019 large cars, the Cadillac CT6 ranks 14th and the Mercedes-Benz S-Class Plug-in Hybrid 9th for lowest fuel cost.

The powertrains differ: the Cadillac CT6 is a conventional gas model, while the Mercedes-Benz S-Class Plug-in Hybrid is a plug-in hybrid.

Frequently asked questions

Which is more fuel-efficient, the 2019 Cadillac CT6 or the 2019 Mercedes-Benz S-Class Plug-in Hybrid?

Measured by cost to drive, the Mercedes-Benz S-Class Plug-in Hybrid. The Cadillac CT6 is rated 28 MPG combined and the Mercedes-Benz S-Class Plug-in Hybrid 64 MPGe + 23 MPG (EPA, most efficient configuration of each).

How much does it cost to fuel the 2019 Cadillac CT6 vs. the Mercedes-Benz S-Class Plug-in Hybrid per year?

At 15,000 miles a year with $3.95/gal premium gas and 18¢/kWh electricity, about $2,116 for the Cadillac CT6 and $2,018 for the Mercedes-Benz S-Class Plug-in Hybrid.

Which has more cargo space?

The Cadillac CT6, with 15 cu ft of luggage volume versus 9 cu ft (EPA interior volume index).

Cadillac CT6 vs Mercedes-Benz S-Class Plug-in Hybrid in other years

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