64 combined MPGe makes the 2025 GMC Sierra EV an efficient full-size pickup. Before looking at the numbers, it is important to understand what the Sierra EV is: a premium, electric workhorse designed to offer substantial towing and hauling capability without the compromises of a traditional internal combustion engine. This isn’t a truck trying to be everything to everyone; it’s explicitly engineered for the customer who demands zero-emissions utility, silent operation, and immediate torque, and who expects their vehicle to also offer a high level of connectivity and refinement. These buyers are often early adopters, tech-savvy professionals, or those with specific environmental mandates, for whom the electric powertrain is not just a novelty but a strategic advantage in their daily operations. They are not simply looking for the cheapest truck; they are investing in advanced technology, and the exceptional efficiency is a core part of that value, directly addressing fuel cost anxieties that plague traditional truck ownership.

City and highway performance

Looking at the 64 MPGe combined rating reveals an impressive 70 MPGe in city driving and 59 MPGe on the highway. The city figure, in particular, highlights the advantage of an electric powertrain in stop-and-go traffic: no idling waste, and significant regenerative braking opportunities that capture energy normally lost to friction. This directly benefits the Sierra EV’s core user base, many of whom navigate urban and suburban environments for work or errands, often with a loaded bed or trailer. The instant torque delivery that contributes to this city efficiency also makes the truck feel responsive and powerful, a desirable trait for any pickup. On the highway, the 59 MPGe is still highly commendable for a vehicle of this size and capability. While higher speeds inherently demand more energy, the Sierra EV’s aerodynamic design (for a truck) and efficient electric motors maintain a strong performance relative to its peers. For buyers who regularly haul heavy loads or tow, maintaining this level of efficiency at highway speeds translates to tangible operational savings over the long term.

Annual fuel cost

The EPA estimates an annual fuel cost of $1,200 for the 2025 GMC Sierra EV. This figure is calculated based on an assumed 15,000 miles of driving per year, with a combination of city and highway travel, and using national average electricity prices. For the Sierra EV owner, this $1,200 represents a significant reduction compared to a gasoline-powered full-size truck. This projected cost is a powerful incentive for those considering the switch to electric, particularly commercial users or small business owners who track operating expenses meticulously. It illustrates the financial benefit of an electric powertrain beyond just environmental considerations, offering a predictable and substantially lower “fuel” bill, even when factoring in the upfront cost of the vehicle. This predictability is a key selling point for fleet managers and individuals alike.

Real-world expectations

While the EPA ratings provide a strong baseline, real-world fuel economy for the Sierra EV will, like any vehicle, depend heavily on driving habits, environmental conditions, and especially payload and towing. Owners of the Sierra EV, however, are often acutely aware of these variables. They understand that consistently towing a heavy trailer will reduce their effective range and MPGe, just as it would with an internal combustion engine. The difference is the predictability of “fueling” costs and the convenience of home charging. Expect to see slightly lower MPGe figures when operating in extreme cold, as battery conditioning and cabin heating draw significant power. Conversely, drivers who optimize their routes for regenerative braking opportunities and maintain consistent, moderate speeds will likely meet or even exceed the EPA estimates. The Sierra EV is designed for individuals who actively manage their vehicle use, whether for commercial contracts or personal projects, making them ideally suited to adapt driving styles for maximum efficiency.

How it compares

Comparing the 2025 GMC Sierra EV to its competition highlights its leading position in efficiency. Take the Ford F-150 Lightning, for instance. The most efficient Lightning trim, the Pro (SR battery), achieves an EPA-rated 68 MPGe combined (76 City / 61 Highway), very closely aligned with the Sierra EV. However, the standard-range Lightning’s capabilities are generally a step below what the Sierra EV offers as standard. Moving to the Lightning Extended Range, the combined MPGe drops slightly to 66 MPGe (78 City / 63 Highway) for the XLT and Lariat trims. The Sierra EV’s 64 MPGe positions it right at the top of the electric truck segment’s efficiency curve, especially considering its premium positioning and strong capabilities. When we look at internal combustion alternatives, the comparison becomes stark. A highly efficient gasoline full-size truck, such as the Ford F-150 with the 3.5L PowerBoost Hybrid engine, achieves around 25 MPG combined, a mere fraction of the Sierra EV’s electric equivalent. Even within all Gmc fuel economy data, the Sierra EV represents a monumental leap in efficiency over its gasoline and diesel counterparts. For someone cross-shopping between a highly capable EV truck and a traditional pickup, the massive difference in operational cost, evident in these efficiency figures, is often a deal-breaker for the latter. The Sierra EV also stands distinct from the Rivian R1T (70 MPGe combined for the Quad-Motor), which while efficient, serves a different, more adventure-focused clientele compared to the Sierra’s heavy-duty and work-oriented mission. For more details on the Sierra’s efficiency across different years, you can review SIERRA MPG across all years.

Tips to maximize efficiency

To get the most out of your 2025 GMC Sierra EV’s range and efficiency, careful driving is key. Use the truck’s regenerative braking feature effectively by anticipating stops and gradually easing off the accelerator, allowing the system to recapture maximum energy back into the battery. Aggressive acceleration and braking waste energy, regardless of the powertrain.

Pre-conditioning the cabin while plugged in is another excellent strategy. By heating or cooling the interior to your desired temperature while the truck is still connected to the charger, you reduce the strain on the battery once you start driving, preserving valuable range for propulsion.

Pay attention to tire pressure. Properly inflated tires reduce rolling resistance, which directly translates to improved efficiency. Check your tires regularly, especially before long trips or when carrying heavy loads, to ensure they are at the manufacturer’s recommended levels.

When towing or hauling, plan your routes carefully, favoring flatter terrain and avoiding unnecessary elevation changes where possible. A heavy load significantly impacts an EV’s range, so minimizing energy expenditure through route optimization is crucial for long-distance efficiency.

Lastly, consider your driving modes. The Sierra EV likely offers various driving modes, and selecting an “Eco” or efficiency-oriented mode can temper accelerator response and optimize ancillary systems, gently nudging you towards a more economical driving style without sacrificing overall capability.