20 MPG combined is what you can expect for fuel economy if you’re considering a 2015 Buick LaCrosse AWD with the 3.6L V6. It’s acceptable for a comfortable, full-size sedan equipped with all-wheel drive, but fuel efficiency isn’t its strongest selling point. LaCrosse buyers usually prioritize a smooth ride, quiet cabin, and spacious interior over saving money at the gas pump. They accept this fuel economy as the cost for a plush driving experience and confident handling in bad weather. This isn’t a car for hypermilers; it’s for those who want a relaxed and refined commute.

City and highway performance

The EPA estimates show where the 2015 LaCrosse AWD 3.6L struggles and where it performs adequately. The 17 MPG city rating shows the engine consumes a lot of fuel in stop-and-go traffic. The more traffic, the more fuel you’ll use. The automatic transmission shifts smoothly but won’t deliver better mileage than the EPA estimates. The 26 MPG highway figure is more respectable and achievable during steady, long-distance driving. This figure indicates good aerodynamics and proper gearing for highway travel. However, aggressive passing or high speeds will quickly lower mileage closer to city numbers.

Annual fuel cost

The EPA says the annual fuel cost for the 2015 Buick LaCrosse AWD 3.6L is $2,200. This is based on driving 15,000 miles per year and national average fuel prices at the time of calculation. Remember that your actual fuel costs may be higher or lower depending on your driving habits, the type of gas you buy, and local fuel prices. The EPA assumes a 55% city / 45% highway driving split. Drivers who only drive in the city will spend much more.

Real-world expectations

The EPA provides a standardized estimate, but real-world fuel economy varies. Expect to see numbers close to the EPA numbers based on how you drive. If you accelerate quickly and enjoy the LaCrosse’s V6 power, expect 16-18 MPG in mixed driving. Careful drivers who prioritize fuel efficiency and use cruise control on the highway might see 27 or even 28 MPG on longer trips. Terrain also matters; hilly areas require more throttle and increase fuel consumption. Learn more about LACROSSE MPG across all years.

How it compares

The 2015 LaCrosse AWD’s fuel economy is comparable to its competitors. A similar 2015 Toyota Avalon AWD, manages a slightly better combined MPG of around 22 MPG with its V6. A 2015 Chrysler 300C AWD with the 5.7L V8 offers similar power but gets a combined MPG of about 19. Front-wheel-drive versions of the LaCrosse offer a slight advantage, typically getting 2-3 MPG combined. For all-wheel-drive buyers, the LaCrosse’s fuel consumption is part of the cost of all-weather control in a comfortable vehicle. If fuel economy is very important, consider smaller sedans or hybrid options. To find all Buick fuel economy data, check our website.

Tips to maximize efficiency

If you drive aggressively you will use more fuel in a LaCrosse. Gentle acceleration and anticipating traffic will save gas. Avoid sudden bursts of speed and maintain a steady pace, especially on the highway.

Regular maintenance is critical. Make sure your tires are properly inflated and follow the scheduled maintenance for oil changes and air filter replacements. This improves engine efficiency and reduces rolling resistance.

The LaCrosse’s all-wheel-drive system adds weight and complexity, impacting fuel economy compared to front-wheel-drive models. Decide if all-wheel drive is needed for your driving conditions. If not, a front-wheel-drive LaCrosse will get better MPG.

Avoid idling. If you expect to stop for more than a minute, turn off the engine. Idling consumes fuel without going anywhere, lowering your average MPG, especially in city driving.