20 MPG combined doesn’t immediately scream “fuel sipper,” but for the 2018 GMC Acadia AWD with the 3.6L V6, it represents a certain pragmatism. This isn’t a vehicle designed for hypermilers; it’s built for families who need space, utility, and all-weather confidence without venturing into full-size SUV territory. Buyers of this Acadia understand that hauling kids, cargo, and the occasional trailer comes with a fuel economy trade-off, and 20 MPG is a compromise they’re often willing to accept.

City and highway performance

The EPA estimates for the 2018 Acadia AWD 3.6L break down to 17 MPG in the city and 25 MPG on the highway. The 17 MPG city figure is respectable for a vehicle of this size and weight, but it does reflect the stop-and-go conditions inherent to urban driving. The Acadia’s 3.6L V6 and six-speed automatic transmission work adequately in these conditions, but the engine needs to work harder to get the Acadia moving from a standstill, especially when loaded with passengers or cargo. On the highway, the 25 MPG rating is more achievable, allowing for decent fuel economy during longer road trips, which are a common use case for this vehicle.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 GMC Acadia AWD 3.6L at exactly $2,200. This figure is based on driving 15,000 miles per year, using the EPA’s combined MPG rating, and assumes national average fuel prices. It’s a useful benchmark for comparing the running costs of different vehicles, but individual fuel expenses can vary depending on driving habits and local fuel prices. For Acadia owners who consistently drive more than 15,000 miles a year, or those who tend to drive more aggressively, the actual fuel cost could be significantly higher. If you want to see all Gmc fuel economy data, we have it on our website.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world MPG figures for the 2018 Acadia AWD 3.6L can vary. Aggressive driving, frequent short trips (where the engine doesn’t reach optimal operating temperature), and carrying heavy loads can all negatively impact fuel economy. Conversely, a driver who prioritizes smooth acceleration, anticipates traffic flow, and maintains a steady speed on the highway is more likely to achieve or even exceed the EPA estimates. Regular maintenance, such as ensuring proper tire inflation and keeping the engine properly tuned, also plays a critical role in maintaining optimal fuel efficiency.

How it compares

The 20 MPG combined rating of the 2018 Acadia AWD 3.6L positions it competitively within its segment, but it’s important to consider alternatives. For example, the Toyota Highlander AWD with its 3.5L V6 generally achieves slightly better MPG, hovering around 22 MPG combined in similar model years. The Ford Explorer with the 2.3L EcoBoost engine offers comparable MPG, but some drivers might find that engine less refined than the Acadia’s V6. The Honda Pilot AWD also boasts superior fuel efficiency, often reaching 23 MPG combined. The Acadia offers a good blend of space, features, and GMC’s brand appeal. Those loyal to the brand may be more interested in ACADIA MPG across all years.

Tips to maximize efficiency

The 2018 Acadia’s six-speed automatic can be slow to upshift, especially during city driving. Use the manual shift mode to encourage earlier upshifts, keeping the engine in its most efficient RPM range. This takes a bit of practice, but can help improve city MPG noticeably.

The Acadia’s AWD system engages automatically when needed, but also adds weight and drivetrain friction. Consider switching to 2WD mode (if your Acadia has it, select models do) during dry conditions to reduce drivetrain drag and improve fuel economy, particularly on the highway.

Check your tire pressure regularly. Underinflated tires increase rolling resistance, which forces the engine to work harder, decreasing fuel efficiency. Maintain the tire pressure recommended on the sticker inside the driver’s side door jamb.

Avoid aggressive acceleration and braking. The Acadia’s weight means that hard starts and stops consume a lot of fuel. Gentle acceleration and anticipating traffic flow allows for smoother, more efficient driving.

Reduce unnecessary weight inside the vehicle. Hauling around extra cargo contributes to lower fuel economy. Remove any items you don’t need from the Acadia’s cargo area and passenger compartment to lighten the load.