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Roush Performance Mustang Fuel Economy (MPG)

What is the real-world gas mileage of a 2021 Roush Performance Mustang?

The 2021 Roush Performance Mustang gets up to 17 MPG combined (14 city / 22 highway) in EPA testing.

Latest model year (2021):

The Roush Performance Mustang gets up to 15 MPG combined (12 city / 19 highway) in the Auto (S10), 8 cyl, 5.0 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
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Roush Performance Mustang MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2021Config 1 of 2Auto (S10), 8 cyl, 5.0 L8 5.0LPremium Gasoline121915
2021Config 2 of 2Man 6-spd, 8 cyl, 5.0 L8 5.0LPremium Gasoline121914
2019Config 1 of 2Auto (S10), 8 cyl, 5.0 L8 5.0LPremium Gasoline121915
2019Config 2 of 2Man 6-spd, 8 cyl, 5.0 L8 5.0LPremium Gasoline132015
2017Config 1 of 2Auto (S6), 8 cyl, 5.0 L8 5.0LPremium Gasoline142217
2017Config 2 of 2Man 6-spd, 8 cyl, 5.0 L8 5.0LPremium Gasoline132316
2016Config 1 of 2Auto (S6), 8 cyl, 5.0 L8 5.0LPremium Gasoline142317
2016Config 2 of 2Man 6-spd, 8 cyl, 5.0 L8 5.0LPremium Gasoline132316
2015Config 1 of 2Auto (S6), 8 cyl, 5.0 L8 5.0LPremium Gasoline132316
2015Config 2 of 2Man 6-spd, 8 cyl, 5.0 L8 5.0LPremium Gasoline132316

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.

Roush Performance Mustang data analysis

How Roush Performance Mustang combined fuel economy varies

Across 10 configurations recorded for the 2015 through 2021 Roush Performance Mustang, combined fuel economy runs from 14 MPG to 17 MPG. The strongest figure belongs to the 2016 Roush Performance Mustang (Auto (S6), 8 cyl, 5.0 L) at 17 MPG, and the weakest to the 2021 car (Man 6-spd, 8 cyl, 5.0 L) at 14 MPG — a spread of 21%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the Roush Performance Mustang would be misleading.

What changed for 2021

Average combined fuel economy for the 2021 Roush Performance Mustang is 14.5 MPG, against 15 MPG for the 2019 car — it fell by 0.5 MPG. Buyers who care most about this figure should look at the earlier model years in the table above before assuming newest is best.

How to read this Roush Performance Mustang data

This page lists every 2015 through 2021 Roush Performance Mustang 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 Roush Performance Mustang numbers

The 2015 through 2021 Roush Performance Mustang entries here cover the variants Auto (S10), 8 cyl, 5.0 L, Man 6-spd, 8 cyl, 5.0 L and Auto (S6), 8 cyl, 5.0 L. 2021 is the busiest model year in the record with 2 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 Roush Performance Mustang 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 Roush Performance Mustang 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 mph23 MPG23 MPG0%
65 mph23 MPG21.4 MPG7%
70 mph23 MPG20 MPG13%
75 mph23 MPG18.6 MPG19%
80 mph23 MPG17.3 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Roush Performance Mustang 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 Mustang MPG

What is the MPG of the Roush Performance Mustang?

The Roush Performance Mustang gets up to 17 MPG combined (14 city / 22 highway) in the 2021 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Roush Performance Mustang trim has the best fuel economy?

The Auto (S6), 8 cyl, 5.0 L trim offers the best combined fuel economy at 17 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

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