28 MPG combined from the 2015 Buick LaCrosse eAssist 2.4L 4-cylinder is a good balance. It’s not head-turning efficiency, but it allows Buick to offer a full-size sedan with the interior space and comfort its customers demand, while still remaining reasonably frugal at the pump. The LaCrosse eAssist targets someone who values comfort and a smooth ride above all else, but who isn’t completely indifferent to fuel costs. This customer isn’t seeking the absolute cheapest option, nor are they chasing sportiness; they’re prioritizing a refined and relaxed driving experience.

City and highway performance

The EPA estimates for the LaCrosse eAssist’s city and highway driving are 24 MPG and 35 MPG, respectively. The 24 MPG city figure reflects the reality of hauling around a larger sedan in stop-and-go traffic. The eAssist system’s mild-hybrid technology provides some benefit here. The system assists with initial acceleration and allows for more frequent engine shut-offs at stoplights, contributing to that 24 MPG rating. On the highway, the LaCrosse eAssist shines. Its smooth-shifting six-speed automatic transmission and aerodynamic profile allow it to cruise efficiently, achieving that noteworthy 35 MPG. These figures indicate a car that’s more suited for longer commutes and highway journeys than constant urban gridlock.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2015 Buick LaCrosse eAssist is $1,550. This figure is based on driving 15,000 miles per year and using the national average fuel price at the time the EPA testing was completed. While fuel prices fluctuate, this $1,550 provides a benchmark for understanding the LaCrosse eAssist’s running costs. It’s a crucial number for potential buyers to consider when budgeting for vehicle ownership, allowing for a direct comparison with other vehicles in its class. Note that your actual fuel costs may vary depending on your driving habits, local fuel prices, and the type of fuel you use.

Real-world expectations

While the EPA estimates provide a valuable baseline, real-world fuel economy inevitably differs. Factors such as driving style, terrain, weather conditions, and even tire pressure can significantly impact the MPG you achieve. Drivers with a heavier foot or those who primarily drive in hilly areas are likely to see lower numbers. However, those who prioritize smooth acceleration and maintain consistent speeds on flat highways can often match or even exceed the EPA’s 35 MPG highway estimate. Diligent maintenance, including regular tire inflation and timely oil changes, will also positively influence fuel efficiency over the long term. Expect a reasonable range of 26-32 MPG in mixed driving conditions.

How it compares

The 2015 LaCrosse eAssist’s fuel economy places it competitively within its segment of full-size sedans, but you should compare it against other mild-hybrid offerings. A comparably equipped Toyota Avalon Hybrid, for example, achieves a notably superior 40 MPG combined. A non-hybrid V6-powered LaCrosse from the same year sees combined MPG numbers in the low 20s. For a more luxurious comparison, consider the Lexus ES 300h, which boasts a combined 40 MPG. The LaCrosse eAssist caters to a buyer seeking a traditional, comfortable sedan experience with a nod towards fuel efficiency, while the hybrids offer a more dedicated approach to maximizing MPG and may sacrifice some traditional sedan characteristics in return. Buyers prioritizing outright fuel savings may lean towards the Avalon Hybrid or ES 300h, but for those seeking a balance of comfort, size, and reasonable fuel economy, the LaCrosse offers a good package. To review more, see all Buick fuel economy data.

Tips to maximize efficiency

Capitalize on the eAssist system’s regenerative braking capabilities. Anticipate stops and coast whenever possible to allow the system to recover energy and recharge the battery. This driving style is particularly effective within urban areas.

Maintain a light and steady foot on the accelerator, especially when accelerating from a standstill. The eAssist system provides extra torque to aid acceleration, so there’s no need to aggressively push the pedal. Smooth, gradual acceleration will minimize fuel consumption.

Ensure your tires are properly inflated to the manufacturer’s recommended pressure. Underinflated tires increase rolling resistance, leading to reduced fuel economy. Check your tire pressure regularly, especially during temperature changes.

Minimize unnecessary weight in the vehicle. The heavier the load, the more fuel the engine consumes. Remove any items from the trunk or backseat that aren’t essential for your journey. Also, research LACROSSE MPG across all years for a broader MPG comparison.

Avoid extended idling. If you anticipate being stopped for more than a minute, turn off the engine. The eAssist system’s auto stop/start feature automatically shuts off the engine at traffic lights, but manually turning off the engine during longer waits will further conserve fuel.