Cadillac XTS Limo Fuel Economy (MPG)

Name: Cadillac XTS Limo MPG & Fuel Economy
Creator: AutoSpecData
License: https://creativecommons.org/licenses/by/4.0/

What is the real-world gas mileage of a 2019 Cadillac XTS Limo?

The 2019 Cadillac XTS Limo gets up to 17 MPG combined (15 city / 21 highway) in EPA testing.

Latest model year (2019):

The Cadillac XTS Limo gets up to 17 MPG combined (15 city / 21 highway) in the Auto (S6), 6 cyl, 3.6 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026

Overview MPG Engine Specs Fuel Cost Transmission Drivetrain Vehicle Class Maintenance

Cadillac XTS Limo MPG — All Years

Year	Trim	Engine	Fuel	City (MPG)	Hwy (MPG)	Combined (MPG)
2019	Auto (S6), 6 cyl, 3.6 L	6 3.6L	Regular Gasoline	15	21	17
2018	Auto (S6), 6 cyl, 3.6 L	6 3.6L	Regular Gasoline	15	21	17
2017	Auto (S6), 6 cyl, 3.6 L	6 3.6L	Regular Gasoline	15	21	17
2016	Auto (S6), 6 cyl, 3.6 L	6 3.6L	Regular Gasoline	15	21	17
2015	Auto (S6), 6 cyl, 3.6 L	6 3.6L	Regular Gasoline	15	21	17

Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.

Cadillac XTS Limo data analysis

How Cadillac XTS Limo combined fuel economy varies

Across 5 configurations recorded for the 2015 through 2019 Cadillac XTS Limo, combined fuel economy runs from 17 MPG to 17 MPG. The strongest figure belongs to the 2015 Cadillac XTS Limo (Auto (S6), 6 cyl, 3.6 L) at 17 MPG, and the weakest to the 2019 car (Auto (S6), 6 cyl, 3.6 L) at 17 MPG — a spread of 0%. The narrow spread means any year of the Cadillac XTS Limo in this table behaves much like the others, so you can shop on price, condition and mileage rather than chasing a particular model year.

What changed for 2019

Average combined fuel economy for the 2019 Cadillac XTS Limo is 17 MPG, against 17 MPG for the 2018 car — it held flat. A carry-over year like this usually means no powertrain or structural change, so an older example is the cheaper way into the same specification.

How to read this Cadillac XTS Limo data

This page lists every 2015 through 2019 Cadillac XTS Limo record we hold for this measurement — 5 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.

Where these Cadillac XTS Limo figures come from

Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The Cadillac XTS Limo record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.

Official Factory Specs vs. AutoSpecData Expert Benchmarks

The EPA highway loop never holds interstate speed. Here is what the same engine does when you sit on the cruise control.

Cruise speed	EPA highway spec	AutoSpecData adjusted MPG	Fuel you lose
60 mph	21 MPG	21 MPG	0%
65 mph	21 MPG	19.6 MPG	7%
70 mph	21 MPG	18.2 MPG	13%
75 mph	21 MPG	17 MPG	19%
80 mph	21 MPG	15.8 MPG	25%

Our Real-World Speed MPG Adjuster re-scales the Cadillac XTS Limo EPA highway result with a quadratic drag term (mpg = hwy ÷ (1 + k·(v² − 60²)/60²), k = 0.55 for trucks, SUVs and vans, 0.42 for cars). Wind, roof racks, and a heavy right foot make it worse, never better.

Frequently Asked Questions About XTS Limo MPG

What is the MPG of the Cadillac XTS Limo?

The Cadillac XTS Limo gets up to 17 MPG combined (15 city / 21 highway) in the 2019 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Cadillac XTS Limo trim has the best fuel economy?

The Auto (S6), 6 cyl, 3.6 L trim offers the best combined fuel economy at 17 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.