The 2023 Lexus IS 300 AWD’s 22 MPG combined fuel economy isn’t terrible, but it’s certainly not winning any awards in a fiercely competitive luxury sport sedan segment. The real question: Does it matter to the core Lexus buyer, and why are they choosing this particular configuration in the first place?

City and highway performance

The 2023 Lexus IS 300 AWD, equipped with its 3.5L V6 and six-speed automatic transmission, gets an EPA-estimated 19 MPG in the city and 26 MPG on the highway. These figures paint a clear picture: this isn’t a car designed for maximizing fuel efficiency on long road trips. The highway number is respectable, yet its city fuel economy underscores a compromise made for the sake of a traditional, naturally aspirated engine and the added security of all-wheel drive. Drivers tackling stop-and-go urban traffic will likely find the fuel gauge dropping faster than they’d like.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Lexus IS 300 AWD at precisely $2,650. This figure is calculated based on driving 15,000 miles per year, using the EPA’s combined MPG rating and assuming national average fuel prices. Keep in mind that your actual fuel costs might vary depending on your driving habits, local fuel prices, and the type of fuel you use. And that six-cylinder engine prefers premium fuel, which inflates that $2,650 wallet-hit even further.

Real-world expectations

While the EPA provides a standardized benchmark, real-world mileage will inevitably differ. Factors like aggressive driving, frequent short trips, extended idling, and even tire pressure can significantly impact your fuel consumption. Owners who prioritize spirited acceleration and regularly use the all-wheel-drive system in challenging conditions should anticipate falling below the EPA’s combined estimate. Conversely, those who adopt a more conservative driving style and primarily use the car for highway commuting may see figures closer to the 26 MPG mark. Understand that the six-speed automatic in this car is geared more for smoothness than efficiency. This isn’t a hybrid or electric car, so don’t expect Prius-like numbers.

How it compares

Compared to its rivals, the 2023 Lexus IS 300 AWD’s fuel economy lands squarely in the middle of the pack. The BMW 330i xDrive, with its turbocharged four-cylinder, achieves a significantly better 28 MPG combined. Even the more powerful BMW M340i xDrive manages a respectable 25 MPG combined. The Acura TLX SH-AWD, equipped with its turbocharged four-cylinder, also offers slightly improved fuel economy compared to the Lexus. The Mercedes-Benz C 300 4MATIC, with its mild-hybrid setup, is another strong competitor. However, some buyers will happily trade those extra MPGs for the Lexus’ legendary reliability. While fuel economy is a practical concern, some prioritize the proven, durable nature of the Lexus V6 engine.

Tips to maximize efficiency

Smooth acceleration is key. Avoid abrupt starts and stops, as these actions burn excess fuel. This is especially important in city driving, where stop-and-go traffic is unavoidable. Use the car’s smooth power delivery to build speed gradually.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which hurts fuel economy. Check your tire pressure regularly and inflate them to the recommended level, typically found on a sticker inside the driver’s side doorjamb.

Reduce excess weight. Carrying unnecessary items in your trunk or backseat adds weight, requiring the engine to work harder and consume more fuel. Clean out your car regularly to remove any unnecessary items.

Consider using the car’s drive modes. The Lexus IS typically offers different driving modes, such as “Eco” mode, which optimizes engine and transmission settings for improved fuel efficiency. Experiment with these modes to see if they make a noticeable difference in your driving experience and fuel consumption.

A well-maintained engine runs more efficiently. Follow the manufacturer’s recommended maintenance schedule, including regular oil changes, filter replacements, and tune-ups. Doing so will ensure your IS is operating at its peak performance and fuel efficiency.

If you’re interested in seeing all Lexus fuel economy data or want to compare IS MPG across all years, we have specific information available.