AutoSpecData

Jaguar XJL Fuel Economy (MPG)

What is the real-world gas mileage of a 2017 Jaguar XJL?

The 2017 Jaguar XJL gets up to 21 MPG combined (18 city / 27 highway) in EPA testing.

Latest model year (2017):

The Jaguar XJL gets up to 21 MPG combined (18 city / 27 highway) in the Auto (S8), 6 cyl, 3.0 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb Weight

Jaguar XJL MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2017Config 1 of 3Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline172520
2017Config 2 of 3Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline182721
2017Config 3 of 3Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline152318
2016Config 1 of 3Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline182721
2016Config 2 of 3Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline172520
2016Config 3 of 3Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline152318
2015Config 1 of 4Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline162419
2015Config 2 of 4Auto (S8), 6 cyl, 3.0 L6 3.0LPremium Gasoline172720
2015Config 3 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline152318
2015Config 4 of 4Auto (S8), 8 cyl, 5.0 L8 5.0LPremium Gasoline152318

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.

Jaguar XJL data analysis

How Jaguar XJL combined fuel economy varies

Across 10 configurations recorded for the 2015 through 2017 Jaguar XJL, combined fuel economy runs from 18 MPG to 21 MPG. The strongest figure belongs to the 2016 Jaguar XJL (Auto (S8), 6 cyl, 3.0 L) at 21 MPG, and the weakest to the 2017 car (Auto (S8), 8 cyl, 5.0 L) at 18 MPG — a spread of 17%. The narrow spread means any year of the Jaguar XJL 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 2017

Average combined fuel economy for the 2017 Jaguar XJL is 19.7 MPG, against 19.7 MPG for the 2016 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 Jaguar XJL data

This page lists every 2015 through 2017 Jaguar XJL record we hold for this measurement — 10 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.

Configurations behind these Jaguar XJL numbers

The 2015 through 2017 Jaguar XJL entries here cover the variants Auto (S8), 6 cyl, 3.0 L and Auto (S8), 8 cyl, 5.0 L. 2015 is the busiest model year in the record with 4 separate measured configurations, which is why a single quoted combined fuel economy figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.

Where these Jaguar XJL 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 Jaguar XJL 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 speedEPA highway specAutoSpecData adjusted MPGFuel you lose
60 mph27 MPG27 MPG0%
65 mph27 MPG25.2 MPG7%
70 mph27 MPG23.4 MPG13%
75 mph27 MPG21.8 MPG19%
80 mph27 MPG20.4 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Jaguar XJL 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 XJL MPG

What is the MPG of the Jaguar XJL?

The Jaguar XJL gets up to 21 MPG combined (18 city / 27 highway) in the 2017 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Jaguar XJL trim has the best fuel economy?

The Auto (S8), 6 cyl, 3.0 L trim offers the best combined fuel economy at 21 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

View full Jaguar XJL specs

MPG for other Jaguar models

MPG on other brands

Compare across every brand

All Jaguar XJL specifications

More Jaguar models

View all Jaguar models →

Browse other makes

Free tools people use next

No account needed
Decode any VINEngine, drivetrain & towing from a VINCompare car sizesOverlay two vehicles to scaleMaintenance scheduleService intervals + PDF exportBest MPG, rankedTop EPA combined MPG by class