21 MPG combined for the 2025 Subaru Ascent Limited, Touring, or Onyx AWD isn’t going to set any efficiency records, but it represents a pragmatic balance for a three-row SUV designed specifically for active American families who prioritize all-weather capability, a strong safety suite, and genuine cargo flexibility. This isn’t a vehicle built for hypermiling; it’s a vehicle built for getting the kids to soccer practice in a blizzard, hauling camping gear down a graded dirt road, or embarking on that annual cross-country adventure without compromise. Its target buyer understands that the permanent all-wheel drive, substantial curb weight, and horizontally opposed 2.4-liter turbocharged engine come with a specific fuel economy profile, and they accept it as part of the Subaru ownership experience.

City and highway performance

Looking at the split, the Ascent manages 19 MPG in the city and 25 MPG on the highway. That 19 MPG urban figure is typical for a family-focused AWD SUV of this size. Stop-and-go traffic, frequent acceleration from standstill, and the constant demands of moving a substantial mass keep that number firmly in check. The Lineartronic CVT (Continuously Variable Transmission), specifically tuned here as an AV-S8, does an admirable job of keeping the turbocharged 2.4-liter flat-four in its most efficient operating range, but there’s only so much it can do against physics. On the open road, the 25 MPG highway figure is respectable. Here, the Ascent settles into a comfortable cruise, the transmission finds its ideal ratio, and the engine’s forced induction provides effortless passing power without revving excessively, making long journeys less taxing on both the driver and the wallet, relatively speaking. For more ASCENT MPG across all years, explore our detailed model data.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,100 for the 2025 Subaru Ascent Limited/Touring/Onyx AWD 2.4L 4-cyl. This figure is based on driving 15,000 miles per year, split between city and highway conditions, and assumes national average fuel prices, which fluctuate. For the Ascent owner, this $2,100 represents a predictable recurring expense. It’s a cost they factor into the family budget alongside insurance, maintenance, and other necessities. They aren’t under any illusion that the Ascent will be a miser at the pump; rather, they appreciate the predictability and the fact that it’s a reasonable sum for the utility and capability the vehicle provides. This isn’t a vehicle chosen to save a few dollars at the gas station; it’s chosen because it reliably gets the family where they need to go, regardless of the weather or terrain. For an exhaustive look at all Subaru fuel economy data, check out our comprehensive database.

Real-world expectations

In real-world driving, many Ascent owners find their fuel economy closely mirrors the EPA estimates, particularly if their driving habits are a mix of urban and highway. However, the Ascent’s all-wheel drive system is always active, and the turbocharged engine can be thirsty if consistently pushed hard. Frequent short trips from a cold start, aggressive acceleration, or extensive use of the Ascent’s impressive towing capacity (up to 5,000 lbs on these trims) will inevitably see figures dip below 21 MPG combined. Conversely, drivers who spend most of their time on open highways at consistent speeds might occasionally see their highway numbers creep a bit higher than 25 MPG. The Ascent is a utility player; its efficiency will reflect how much utility you’re demanding from it. Expect consistency, not surprises, when you fill up.

How it compares

When placed against its segment rivals, the Ascent’s 21 MPG combined is competitive, though not class-leading. Compared to the Honda Pilot TrailSport’s 20 MPG combined (18 city/23 highway) with its V6, the Ascent holds a slight edge, reflecting the efficiency advantage of its smaller displacement turbocharged four-cylinder. The Kia Telluride and Hyundai Palisade, both equipped with V6 engines and AWD, also sit around 21 MPG combined (19 city/24 highway), making the Ascent virtually identical in overall efficiency to these popular contenders. The Mazda CX-90, with its mild-hybrid turbocharged inline-six, achieves 25 MPG combined in AWD form (23 city/28 highway), illustrating that newer powertrain tech can offer a significant gain. Even the more rugged Toyota Grand Highlander Hybrid AWD offers an impressive 36 MPG combined. However, the Ascent’s primary rivals remain the non-hybrid V6 SUVs, where its four-cylinder turbo holds its own. Buyers prioritizing maximum fuel economy in this segment often look to hybrid options, but the Ascent buyer is typically looking for a simpler, proven, permanently AWD system with a direct connection to Subaru’s rugged, outdoorsy brand ethos.

Tips to maximize efficiency

Maintaining consistent tire pressure is critical for the Ascent, as underinflated tires significantly increase rolling resistance, forcing the engine to work harder. Check your pressures monthly, especially before longer drives or when temperatures change significantly, referring to the placard on your driver’s door jamb.

While the Ascent’s turbocharged engine offers satisfying acceleration, try to maintain a smooth driving style. Gradual acceleration and anticipating traffic to avoid hard braking minimize fuel consumption, allowing the CVT to operate in its most efficient range.

Minimize unnecessary weight. Luggage, tools, or other heavy items left in the cargo area add to the vehicle’s mass, decreasing fuel economy. Remove roof racks or cargo carriers when not in use, as they create aerodynamic drag, particularly at highway speeds.

Use the Ascent’s X-MODE only when necessary. While fantastic for low-traction conditions, X-MODE can subtly alter throttle response and vehicle dynamics in a way that isn’t optimized for fuel efficiency on dry pavement.

Adhere to the recommended service schedule. A well-maintained engine with clean air filters, fresh spark plugs, and properly functioning sensors will always operate more efficiently than one that is neglected, ensuring the 2.4-liter turbo consistently performs at its best.