2020 GMC Acadia — Full Specifications
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The 2020 GMC Acadia is an SUV offered with 3 engines (2L 4-cyl turbo, 2.5L 4-cyl, 3.6L 6-cyl). Its most fuel-efficient configuration returns around 29 mpg (UK) / 24 mpg (US EPA) combined, with 25–29 mpg (UK) across all configurations. Owners often keep a GMC Acadia workshop manual to hand for servicing and repairs.
Compared with the 2019 GMC Acadia: Fuel economy is essentially unchanged at around 29 mpg (UK) combined. EPA lists new engine options for 2020: 2L 4-cyl turbo. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine (most efficient) | 2L 4-cyl turbo |
|---|---|
| Engine options | 2L 4-cyl turbo · 2.5L 4-cyl · 3.6L 6-cyl |
| Transmission (most efficient) | Automatic 9-spd |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Front-Wheel Drive |
| Body Style | SUV |
| Length | 5108 mm |
| Fuel Economy (UK) | 29 combined / 25 urban / 34 extra-urban mpg |
| Fuel Economy (US EPA) | 24 combined / 21 city / 28 highway mpg |
| CO₂ Emissions | 225 g/km |
| EPA Greenhouse Gas Score | 5 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,800 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 5 configurations for the 2020 GMC Acadia across 3 engines (2L 4-cyl turbo, 2.5L 4-cyl, 3.6L 6-cyl). Combined fuel economy ranges from 21 to 24 mpg (US), or 25 to 29 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 2L 4-cyl turbo | Automatic 9-spd | All-Wheel Drive | 28 | 23 (21/27) | 232 | $2,900 |
| 2L 4-cyl turbo | Automatic 9-spd | Front-Wheel Drive | 29 | 24 (21/28) | 225 | $2,800 |
| 2.5L 4-cyl | Automatic 9-spd | Front-Wheel Drive | 28 | 23 (21/27) | 237 | $2,900 |
| 3.6L 6-cyl | Automatic 9-spd | All-Wheel Drive | 25 | 21 (18/25) | 269 | $3,200 |
| 3.6L 6-cyl | Automatic 9-spd | Front-Wheel Drive | 26 | 22 (19/27) | 257 | $3,050 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
Owner Essentials for the 2020 GMC Acadia
Running Costs: 2020 GMC Acadia
Covering around 8,000 miles a year in a 2020 GMC Acadia at 29 mpg combined, expect roughly 1,254 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,800 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Planning a road trip? Grab a road trip packing list. Only need this car occasionally? See our buy vs rent comparison.
2020 GMC Acadia Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists 6 safety recall campaigns that include the 2020 GMC Acadia (as of 6 October 2026). Most affected areas: Tires (2), Back over prevention (1), Power train (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
- Back over prevention — campaign 22V709000, reported 22 September 2022. Risk: An inoperative rearview camera can reduce the driver's rear visibility, increasing the risk of a crash.
- Tires — campaign 21V115000, reported 25 February 2021. Risk: Over cured tires may develop a break in the sidewall resulting in sudden air loss or a belt edge separation which could lead to a tread/belt loss. Either condition can cause a loss of vehicle control,…
- Tires — campaign 20V684000, reported 5 November 2020. Risk: Overcured tires may experience a carcass break in the sidewall resulting in a sudden air loss or could develop a belt edge separation which could lead to partial or full tread/belt loss. Either condition…
- Power train — campaign 20V668000, reported 29 October 2020. Risk: Missing bolts on the start-stop accumulator endcap could result in a transmission oil leak and may progress to a loss of propulsion, increasing the risk of a crash. A transmission fluid leak in the presence of…
Showing the 4 most recent of 6 campaigns.
Owners have filed 106 complaints with NHTSA about the 2020 GMC Acadia. The most-reported areas are Engine (29), Electrical system (28), Power train (22). Complaints include 4 reported crashes, 2 reported injuries. That is well below the median of 236 complaints across the 17 GMC Acadia model years in our data.
Used-buyer checklist for the 2020 GMC Acadia
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Transmission & drivetrain (1 recall campaign · 22 owner complaints) — On the test drive, watch for hesitation, jerking or slipping between gears and ask for transmission service history.
- Engine (29 owner complaints) — Listen for unusual noise on a cold start, check for warning lights and ask for the service records.
- Electrical system (28 owner complaints) — Test every switch, window, light and warning lamp on a test drive, and ask about battery or alternator replacements.
- Steering (20 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
How does the GMC Acadia compare to similar SUVs? For context, SUVs in our database average around 27 mpg (UK) combined — this model's 29 mpg figure is 2 mpg better than that average. Its 225 g/km CO₂ figure is 28 g/km lower than the 253 g/km average for SUVs on this site. This comparison is based on 1824 SUVs in our dataset.
GMC models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2020 GMC Acadia's 29 mpg is 3 mpg above that make average. Its 225 g/km CO₂ figure is 47 g/km lower than the 272 g/km GMC average.
Of the 17 GMC Acadia model years we cover, the 2020 ranks 4th for combined fuel economy on its best configuration (29 mpg UK combined, against a high of 30 mpg). See every GMC Acadia year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2020 GMC Acadia
Frequently Asked Questions
What engine does the 2020 GMC Acadia have?
EPA lists 3 engines for the 2020 GMC Acadia: 2L 4-cyl turbo, 2.5L 4-cyl, 3.6L 6-cyl. The most fuel-efficient configuration pairs the 2L 4-cyl turbo with a automatic 9-spd.
What is the fuel economy of the 2020 GMC Acadia?
The most efficient configuration returns around 29 mpg (UK) combined, or 24 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 25 to 29 mpg.
How much does the 2020 GMC Acadia cost to fuel per year?
The US EPA estimates about $2,800 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2020 GMC Acadia have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 5 stars for frontal crash protection.
Does the 2020 GMC Acadia have any recalls?
NHTSA lists 6 safety recall campaigns that include the 2020 GMC Acadia (as of 6 October 2026). Most affected areas: Tires (2), Back over prevention (1), Power train (1). A campaign often covers several model years or models, so check your own VIN to see whether your car is affected.
What are the most common problems reported for the 2020 GMC Acadia?
Among the 106 owner complaints filed with NHTSA, the most-reported areas are Engine (29 complaints), Electrical system (28 complaints), Power train (22 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
Is the GMC Acadia's fuel economy good for an SUV?
Yes — it returns around 29 mpg (UK) combined, against a same-body-style average of roughly 27 mpg among the SUVs we track.