The 2018 Lexus GS 350 AWD gets 22 MPG combined, not a fuel economy leader. People buy this car for its smooth power, all-weather confidence, and Lexus reliability, not for its fuel efficiency. GS 350 AWD buyers understand the trade-off and accept it for the experience the car delivers.

City and highway performance

The EPA estimates the GS 350 AWD gets 19 MPG in the city and 26 MPG on the highway. The city figure reflects stop-and-go driving, where the 3.5L V6 engine is less efficient. The highway number is better, made possible by the six-speed automatic transmission and relaxed cruising at legal speeds. Aggressive driving or extended periods at higher speeds will lower the highway number. Owners who prioritize smooth acceleration and use cruise control diligently will see the best results. These numbers are from the EPA’s testing, and individual results can vary based on driving style and conditions.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus GS 350 AWD at $2,650. This is based on driving 15,000 miles per year, using the EPA’s combined MPG rating and assuming national average fuel prices. The actual amount you spend on fuel will depend on how many miles you drive each year, as well as local gas prices. Those who drive fewer miles annually will have a lower fuel bill, while those who drive more can expect to pay more. While combined MPG is the best single indicator, the annual fuel cost puts the efficiency into dollar terms.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy often differs. Expect to see figures close to the EPA estimates if you drive moderately. Frequent hard acceleration, excessive idling, and aggressive braking will all negatively impact your MPG. Many owners report similar numbers, with some achieving slightly better highway figures on long road trips. Regular maintenance, including tire inflation and oil changes, also plays a critical role in maintaining optimal fuel efficiency. Remember to check the vehicle’s trip computer regularly to monitor your MPG and adjust your driving habits.

How it compares

In the mid-size luxury sedan segment, the 2018 Lexus GS 350 AWD isn’t a leader in fuel economy. The Acura TLX SH-AWD achieves a slightly better 24 MPG combined with its V6 engine. Even some turbocharged four-cylinder options in competitors like the BMW 530i xDrive (27 MPG combined) offer significantly improved fuel efficiency while delivering comparable performance. But consumers considering models or brands are interested in all Lexus fuel economy data. The GS 350 AWD buyer likely values the smooth, naturally aspirated power delivery of the V6 and the Lexus reputation for reliability, and they are willing to accept the fuel economy impact. Exploring GS MPG across all years can reveal interesting trends.

Tips to maximize efficiency

Avoid aggressive acceleration. The GS 350 AWD’s V6 delivers ample power, so using it unnecessarily burns extra fuel. Smooth, gradual acceleration will significantly improve your MPG, especially in city driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended pressure listed on the driver’s side doorjamb.

Minimize idling. Idling for extended periods wastes fuel. If you expect to be stopped for more than a minute or two, turn off the engine. This is especially important in colder climates where people tend to let their cars idle to warm them up.

Use cruise control on the highway. Maintaining a constant speed on the highway is more fuel-efficient than constantly accelerating and decelerating. Cruise control helps you maintain a consistent speed, improving your highway MPG.

Keep up with routine maintenance. Regular oil changes, air filter replacements, and spark plug maintenance ensure that the engine is running efficiently. Neglecting these tasks can negatively impact fuel economy.