2018 Cadillac CT6 Plug-In MPG & Specs — Real Fuel Cost
Quick answer
The 2018 Cadillac CT6 Plug-In gets an EPA-estimated 23/29 MPG (city/highway) and 25 MPG combined, with an estimated $3,050/year fuel cost and 144 g/mi CO₂. Engine: 2 L 4-cyl.
The 2018 Cadillac CT6 Plug-In with the 2-liter 4-cylinder premium gasoline engine returns an EPA-estimated 23 MPG in the city and 29 MPG on the highway, for a combined 25 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 2 L 4-cyl |
| Transmission | Automatic (variable gear ratios) |
| Drive | Rear-Wheel Drive |
| Fuel type | Premium Gasoline |
| Vehicle class | Midsize Cars |
| MPG — city | 23 |
| MPG — highway | 29 |
| MPG — combined | 25 |
| Annual fuel cost* | $3,050 |
| CO₂ tailpipe | 144 g/mi |
| EPA GHG score | 10/10 |
| Electric range | 430 mi |
How efficient is it?
With a combined 25 MPG, the 2018 Cadillac CT6 Plug-In sits in the moderate range for fuel economy. That is about average for its class (Midsize Cars, 26 MPG average).
Fuel economy and running costs
At about $3,050 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2018 Cadillac CT6 Plug-In. Over five years that is roughly $15,250 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2018 Cadillac CT6 Plug-In emits approximately 144 grams of CO₂ per mile at the tailpipe, earning an EPA greenhouse-gas score of 10 out of 10. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.