23 MPG combined is the headline for the 2018 GMC Canyon 4WD with its 2.8L Duramax diesel engine, a figure likely to elicit a shrug from anyone cross-shopping family SUVs. However, for the specific buyer seeking a compact truck with genuine towing capability, respectable off-road prowess, and the added benefit of diesel efficiency, it’s an MPG number that lands squarely in the “good enough” category. The Canyon, especially in this diesel-equipped four-wheel-drive configuration, occupies a distinct niche, serving those who need more than a sedan but less than a full-size pickup. Its fuel economy, therefore, needs to be viewed through that lens of utility and capability rather than simple numerical supremacy.

City and highway performance

The 2018 GMC Canyon 2.8L diesel returns an EPA-estimated 20 MPG in the city and 28 MPG on the highway. This split reflects the engine’s characteristics; the low-end torque that makes it excellent for towing also means it works relatively effortlessly in stop-and-go city driving. Out on the highway, the Canyon cruises comfortably, with the diesel engine barely breaking a sweat, contributing to that higher MPG figure. The six-speed automatic transmission is well-matched to the engine’s power delivery, keeping the RPMs low and helping to maximize fuel efficiency at cruising speeds. Unlike some larger trucks that see their MPG plummet in city driving, the Canyon’s smaller footprint and relatively lightweight construction allow it to maintain a reasonable level of efficiency even when navigating urban landscapes.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 GMC Canyon 4WD 2.8L at $2,400. That figure is based on driving 15,000 miles per year, with fuel prices reflecting the national average at the time of calculation. While individual fuel costs will vary depending on driving habits and local diesel prices, this $2,400 estimate provides a useful benchmark for comparing the Canyon’s fuel expenses to those of other vehicles. Consider that diesel fuel prices are often higher than gasoline, and it underscores that the Canyon buyer values the engine’s durability and towing capacity as much as, if not more than, pure fuel savings. Those looking at alternatives may want to check all GMC fuel economy data to see if a different engine choice saves money over time.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy for the 2018 GMC Canyon 2.8L diesel can vary significantly. Towing, hauling heavy loads, or engaging four-wheel drive will all reduce MPG. Conversely, careful driving habits and predominantly highway miles can push the MPG closer to, or even slightly above, the EPA’s estimates. The Canyon’s relatively small diesel engine doesn’t have a huge reserve of excess power, so pushing it hard will have a more noticeable impact on fuel consumption than in a larger truck with a more powerful engine. Buyers should also be aware that factors such as tire pressure, ambient temperature, and even the blend of diesel fuel can all influence fuel economy.

How it compares

Compared to its competitors, the 2018 GMC Canyon 2.8L diesel occupies an interesting position. The Toyota Tacoma, a perennial favorite in the compact truck segment, achieves around 20 MPG combined with its V6 engine in four-wheel-drive configuration. The Nissan Frontier, while offering a lower purchase price, lags behind in fuel economy, typically returning around 17 MPG combined with its V6 and 4WD. The Chevrolet Colorado, mechanically identical to the Canyon, offers the same fuel economy numbers with its 2.8L diesel. What sets the Canyon apart is its diesel option, which provides superior low-end torque for towing compared to the gasoline-powered alternatives. For those specifically seeking a diesel-powered compact truck with 4WD, the Canyon and Colorado are essentially the only options available, making the fuel economy comparison somewhat moot. Buyers should consider CANYON MPG across all years to see the impact of engine changes.

Tips to maximize efficiency

Proper tire inflation is critical for maximizing fuel economy in the 2018 GMC Canyon 2.8L diesel. Regularly check your tire pressure and inflate them to the manufacturer’s recommended PSI, typically found on a sticker inside the driver’s side doorframe. Under-inflated tires increase rolling resistance, leading to lower MPG.

Avoid aggressive acceleration and braking. The Canyon’s diesel engine provides plenty of low-end torque, so there’s no need to floor the accelerator to get up to speed. Gentle acceleration and anticipating traffic conditions to avoid hard braking will conserve fuel. These habits also extend the life of mechanical components.

Minimize idling time. Diesel engines consume more fuel when idling compared to gasoline engines, so avoid unnecessary idling, especially during cold weather. If you anticipate being stopped for more than a minute, it’s more efficient to turn off the engine.

When towing, select the appropriate tow/haul mode. This mode optimizes the transmission’s shift points for towing, helping to keep the engine in its most efficient operating range. Remember that towing significantly reduces fuel economy, so plan your trips accordingly and drive conservatively.

Keep up with regular maintenance. A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended maintenance schedule, including oil changes, filter replacements, and fuel system cleaning, to ensure optimal fuel economy.