2018 Cadillac CT6 AWDFuel Economy & MPG Ratings

Gasoline Large CarsAll-Wheel Drive

City

MPG

Highway

MPG

Combined

MPG

Trim Comparison

Automatic (S8)

Premium

City

Hwy

Comb

Fuel cost: $3,900/yr

Automatic (S8)

Regular

City

Hwy

Comb

Fuel cost: $3,200/yr

Trim	Engine	City	Hwy	Combined	Fuel Cost/yr
Automatic (S8)	Premium	18	26	21	$3,900
Automatic (S8)	Regular	18	27	21	$3,200

Annual Fuel Cost

$3,900

Based on gasoline at $3.67/gal, 15,000 miles/year

5-Year Fuel Savings

$-7,500

vs. average new vehicle

EPA Fuel Economy Score: 4/10

GHG Score: 4/10

Environment

CO₂ Tailpipe Emissions: 424 g/mile
Annual Petroleum Consumption: 14.2 barrels

Specifications

Engine: 3.6L 6-cyl
Transmission: 8-speed Automatic
Drivetrain: AWD
Body Style: Sedan

Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.

Engine & Efficiency Details

Source: EPA fueleconomy.gov

Engine Size: 3L, 6-cylinder
Induction Type: Direct Injection
Efficiency Tech: Auto Start-Stop
Fuel Type: Premium Gasoline

Annual Fuel Cost by State

Prices as of week ending May 18, 2026 · Source: EIA

National AvgEPA default

$4.490/gal$3,207/yr

California

$5.957/gal$4,255/yr

Texas

$3.888/gal$2,777/yr

Florida

$4.136/gal$2,954/yr

New York

$4.522/gal$3,230/yr

Ohio

$4.510/gal$3,221/yr

Washington

$5.591/gal$3,994/yr

Colorado

$4.618/gal$3,299/yr

Minnesota

$4.344/gal$3,103/yr

Massachusetts

$4.448/gal$3,177/yr

State	Gas Price	Annual Cost	vs. National Avg
National AvgEPA default	$4.490/gal	$3,207/yr	—
California	$5.957/gal	$4,255/yrHIGHEST	+$1,048
Texas	$3.888/gal	$2,777/yrLOWEST	$-430
Florida	$4.136/gal	$2,954/yr	$-253
New York	$4.522/gal	$3,230/yr	+$23
Ohio	$4.510/gal	$3,221/yr	+$14
Washington	$5.591/gal	$3,994/yr	+$787
Colorado	$4.618/gal	$3,299/yr	+$92
Minnesota	$4.344/gal	$3,103/yr	$-104
Massachusetts	$4.448/gal	$3,177/yr	$-30