2021 Acura RLX Specs: MPG, Gas Mileage, Engine Size & Dimensions
2021 Acura RLX Specs at a Glance
The 2021 Acura RLX gets 30 mpg combined on the 3.5L All-Wheel Drive configuration, weighs 4,394 lbs, measures 197.6 in long. Figures are per configuration, not a single official number — other trims rate as low as 23 mpg combined. Every figure below comes from EPA, NHTSA, or manufacturer published data — no estimates.
- Combined MPG
- 30 mpg (28 city / 31 hwy)
- Best configuration: 3.5L · All-Wheel Drive · Automatic (AM7) · other 2021 trims rate 23–30 mpg combined
- Engine
- 3.5L 6-cyl
- 3.5L · All-Wheel Drive · Automatic (AM7)
- Curb weight
- 4,394 lbs
- Heaviest recorded configuration: RLX 4DR SEDAN
- Length
- 197.6 in · 74.8 in wide · 57.5 in tall
- Wheelbase
- 112.2 in
Detailed Specifications
MPG & Fuel Economy
MPG for every year and trim
View details →Engine Specifications
Engine Specs for every year and trim
View details →Annual Fuel Cost
Fuel Cost for every year and trim
View details →Transmission Specifications
Transmission for every year and trim
View details →Drivetrain & Drive Type
Drivetrain for every year and trim
View details →Vehicle Class & EPA Size Category
Vehicle Class for every year and trim
View details →Maintenance Schedule & Service Intervals
Maintenance for every year and trim
View details →Dimensions & Size
Dimensions for every year and trim
View details →Curb Weight
Curb Weight for every year and trim
View details →Acura RLX — All Years Overview
| Year | Trim | Engine | Trans | Drive | City | Hwy | Combined | Fuel |
|---|---|---|---|---|---|---|---|---|
| 2020 | Auto (AM-S7), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (AM-S7) | All-Wheel Drive | 28 | 29 | 28 | Premium Gasoline |
| 2020 | Auto (S10), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S10) | Front-Wheel Drive | 20 | 29 | 23 | Premium Gasoline |
| 2019 | Auto (AM-S7), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (AM-S7) | All-Wheel Drive | 28 | 29 | 28 | Premium Gasoline |
| 2019 | Auto (S10), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S10) | Front-Wheel Drive | 20 | 29 | 23 | Premium Gasoline |
| 2018 | Auto (AM-S7), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (AM-S7) | All-Wheel Drive | 28 | 29 | 28 | Premium Gasoline |
| 2018 | Auto (S10), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S10) | Front-Wheel Drive | 20 | 29 | 23 | Premium Gasoline |
| 2017 | Auto (AM-S7), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (AM-S7) | All-Wheel Drive | 29 | 30 | 29 | Premium Gasoline |
| 2017 | Auto (S6), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S6) | Front-Wheel Drive | 20 | 30 | 23 | Premium Gasoline |
| 2016 | Auto (AM7), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (AM7) | All-Wheel Drive | 28 | 31 | 30 | Premium Gasoline |
| 2016 | Auto (S6), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S6) | Front-Wheel Drive | 20 | 30 | 23 | Premium Gasoline |
| 2015 | Auto (S6), 6 cyl, 3.5 L | 6 · 3.5L | Automatic (S6) | Front-Wheel Drive | 20 | 30 | 23 | Premium Gasoline |
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All Acura RLX specifications
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View all Acura models →Acura RLX — Frequently Asked Questions
What is the fuel economy of the 2020 Acura RLX?
The Acura RLX is EPA-rated at up to 30 MPG combined (28 city / 31 highway), a historical peak recorded on the 2016 model year.
What engine does the 2020 Acura RLX have?
The Acura RLX uses a 3.5L 6-cylinder engine paired with an Automatic transmission.
What years of the Acura RLX are covered here?
This page documents 11 verified Acura RLX configurations across model years 2015–2020.
Which model year of the Acura RLX is the most fuel efficient?
The 2016 Acura RLX holds the highest combined rating at 30 MPG; the 2015 sits lowest at 23 MPG, a difference of 7 MPG (about 30%) across the 6 rated years on file.
How many engine options does the Acura RLX have?
Across every year on record the Acura RLX uses one displacement, 3.5L, so trims differ by drivetrain and equipment rather than engine size.
Is the 2020 Acura RLX front-wheel drive or all-wheel drive?
The Acura RLX appears in 2 drivetrain layouts across the years documented here — All-Wheel Drive, Front-Wheel Drive — with the latest 2020 record on All-Wheel Drive.