21 MPG combined isn’t going to win the 2015 Lexus GS 350 AWD any environmental awards, but it’s a perfectly acceptable figure for a comfortably sized, all-weather luxury sedan with a naturally aspirated V6 engine. This car isn’t about hypermiling; it’s about a smooth, reliable driving experience with enough power to confidently navigate any situation, wrapped in Lexus levels of refinement. Those who prioritize ultimate fuel efficiency simply aren’t shopping in this segment, or certainly not for an all-wheel-drive variant.

City and highway performance

The EPA estimates the GS 350 AWD will achieve 19 MPG in the city and 26 MPG on the highway. The seven-mile-per-gallon spread between city and highway driving suggests this vehicle benefits noticeably from consistent speeds and minimal stop-and-go traffic situations. The six-speed automatic transmission is geared more towards relaxed cruising than aggressive acceleration, further optimizing fuel consumption at higher speeds. For those who spend the majority of their time battling urban congestion, the city MPG figure provides a more realistic benchmark.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2015 Lexus GS 350 AWD is estimated to be $2,750. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this is an estimate and your actual fuel costs may vary depending on your driving habits, the type of fuel you use, and local fuel prices. It’s a fixed cost to factor into the ownership equation, giving buyers who appreciate the GS 350’s blend of luxury and performance a clear financial picture.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy often deviates. The GS 350’s naturally aspirated V6 encourages drivers to explore the upper reaches of the tachometer, which will invariably impact fuel consumption. Similarly, the added weight and drivetrain losses associated with all-wheel drive can diminish fuel economy, particularly in city driving. Expect to see figures closer to the EPA estimates during relaxed highway cruising, but potentially lower numbers during more spirited driving or in heavy traffic. Consult the GS MPG across all years to understand owner-reported figures.

How it compares

The 2015 Lexus GS 350 AWD’s fuel economy falls within expectations for its class. The BMW 535i xDrive from the same year, also featuring all-wheel drive and a six-cylinder engine, posts an EPA combined rating of 23 MPG. This difference, while seemingly small, can add up over time. A Mercedes-Benz E350 4Matic, another key competitor, achieves a similar 24 MPG combined. The slightly lower numbers for the GS 350 AWD reflect Lexus’ focus on reliability and simplicity over squeezing out every last drop of efficiency. Those prioritizing peak MPG might consider the Lexus GS 450h hybrid, while those needing AWD choose the GS 350 AWD. Drivers willing to sacrifice all-wheel drive can find slightly better numbers with the rear-wheel-drive GS 350. For more information, consult all Lexus fuel economy data.

Tips to maximize efficiency

Use premium fuel as recommended. While the GS 350 might run on regular gasoline, using premium fuel can optimize engine performance and potentially improve fuel economy, especially under heavier loads or during aggressive driving.

Practice smooth acceleration and braking. Avoid sudden bursts of speed or hard braking, as these habits significantly reduce fuel efficiency. Anticipate traffic flow and maintain a consistent speed whenever possible. Use cruise control on the highway to maintain a steady pace and optimize fuel consumption.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check your tires regularly and inflate them to the recommended pressure listed on the tire placard located on the driver’s side doorjamb.

Minimize idling. Excessive idling wastes fuel and contributes to emissions. If you anticipate being stopped for more than a minute, turn off the engine. The GS 350’s quiet engine restart makes this possible.

Reduce unnecessary weight. Remove any unnecessary items from the trunk or backseat, as added weight reduces fuel efficiency. Every extra 100 pounds can decrease MPG, especially during city driving.