23 MPG combined isn’t going to win any awards, but for the 2018 Buick LaCrosse AWD with the 3.6L V6, it’s a number its target demographic accepts and understands. This is a car bought for comfort, space, and a quiet ride, typically by drivers prioritizing a smooth experience over saving gas. They’re not expecting Prius-level efficiency, and the LaCrosse delivers the relaxed, confident performance they seek, even if it means paying a little extra at the pump.

City and highway performance

The EPA estimates 20 MPG in the city and 29 MPG on the highway for this LaCrosse configuration. The city figure reflects stop-and-go traffic, where the all-wheel-drive system and the V6 engine work harder, reducing efficiency. On the open road, however, the nine-speed automatic transmission allows the engine to cruise at lower RPMs, contributing to improved fuel economy. The nearly 50% jump in MPG on the highway demonstrates where this powertrain performs best: eating up miles on long journeys, where its refined character really shines.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Buick LaCrosse AWD 3.6L is $1,900. This figure is based on driving 15,000 miles per year, with an assumed fuel price reflecting national averages. Your actual fuel costs may vary depending on your driving habits, local fuel prices, and the percentage of city versus highway driving. This $1,900 figure provides a reasonable baseline for budgeting your car expenses, but personalized calculations are always recommended.

Real-world expectations

While the EPA provides a standardized testing procedure, real-world fuel economy often differs. Aggressive driving, frequent short trips, and even weather conditions can all impact your MPG. LaCrosse owners who prioritize smooth acceleration and use premium fuel might see slightly lower figures than the EPA estimates. Conversely, those who adopt a gentler driving style and spend more time on the highway could see figures closer to, or even slightly exceeding, the 29 MPG highway rating.

How it compares

Compared to other large sedans with similar power and features, the LaCrosse’s fuel economy is competitive, but not class-leading. For example, the Toyota Avalon, a known fuel economy champ, achieves around 22 MPG city and 32 MPG highway with its V6 engine. The Nissan Maxima, another popular option, returns figures around 21 MPG city and 30 MPG highway. If you’re cross-shopping other GM offerings, the front-wheel-drive version of the LaCrosse with the same 3.6L engine will invariably do slightly better in the MPG department. For those seriously considering a Buick, checking out all Buick fuel economy data might be a good idea.

Tips to maximize efficiency

The nine-speed transmission in the 2018 LaCrosse is designed to optimize fuel economy, so let it do its job. Avoid aggressive acceleration and hard braking, as these actions force the transmission to downshift frequently and burn more fuel. Gentle, progressive throttle inputs are the key to maximizing efficiency in this powertrain.

Regular maintenance can play an important role in maintaining fuel economy. Keep your tires properly inflated, as underinflated tires increase rolling resistance and reduce MPG. Schedule regular oil changes and ensure that your air filter is clean, as these simple tasks can prevent unnecessary engine strain.

Consider using cruise control on the highway to maintain a constant speed and minimize fluctuations in fuel consumption. While cruise control might seem like an easy solution, be mindful of hills and traffic patterns. Disengaging the system when climbing steep inclines can prevent unnecessary downshifting and fuel consumption.

Since this generation of LaCrosse has been around for a few years, consumers looking for the best efficiency can also consider older models and analyze LACROSSE MPG across all years. While older generations might not have the nine-speed transmission, they could still offer similar levels of comfort and features with potentially improved fuel economy ratings.