The 2019 Lexus IS 300 AWD gets 21 MPG combined, which is likely acceptable to most owners. They are choosing this model for its all-wheel drive, the smooth V6 engine, and Lexus’s refinement and reliability. Fuel economy is a consideration, but is balanced with other priorities.

City and highway performance

EPA estimates for the IS 300 AWD break down to 19 MPG in the city and 26 MPG on the highway. The lower city figure reflects stop-and-go traffic, where the engine works harder and the transmission shifts more frequently. The highway number is more attainable, especially during steady cruising. The six-speed automatic transmission, while smooth and responsive, isn’t as optimized for fuel economy as the eight- or ten-speed units in some competitors, resulting in a slightly lower highway figure.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2019 Lexus IS 300 AWD at $2,750. This is based on driving 15,000 miles per year and the national average fuel prices. Your actual fuel costs could be higher or lower depending on your driving habits, if you do mostly city or highway driving, and where you live because fuel prices vary significantly from region to region. This number provides a good baseline for comparing the IS 300’s running costs to other vehicles in its class, and it requires using premium fuel, which the IS 300 recommends.

Real-world expectations

EPA estimates are a useful benchmark, but real-world fuel economy often differs. Drivers who accelerate quickly or frequently encounter stop-and-go traffic will likely see numbers below the EPA estimates. Those who accelerate smoothly and maintain consistent highway speeds may achieve numbers closer to, or slightly exceeding, the EPA ratings. The IS 300’s smaller engine, all-wheel drive, and the less efficient 6-speed transmission, mean that aggressive driving will significantly impact fuel consumption.

How it compares

The 2019 Lexus IS 300 AWD’s fuel economy is in the middle of its class. For example, the BMW 330i xDrive, with its turbocharged 2.0-liter four-cylinder engine, has better EPA ratings, around 28 MPG combined. However, some buyers prefer the smoothness and sound of a naturally aspirated V6, even with a slight fuel economy disadvantage. The Acura TLX SH-AWD with the V6 engine gets roughly similar numbers, around 20 MPG combined, making it a direct competitor in terms of performance and efficiency. You can view all Lexus fuel economy data on this site for more comparisons. Considering other IS models is also wise: IS MPG across all years is easily accessible.

Tips to maximize efficiency

Gentle acceleration is key. Avoid sudden speed and try to maintain a steady pace. The IS 300’s V6 engine is responsive, but it consumes more fuel when pushed hard. Smooth, progressive acceleration minimizes fuel consumption.

Proper tire inflation can also help. Check your tire pressure regularly and ensure it matches the recommended pressure on the driver’s side doorjamb. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy.

Reduce unnecessary weight. Extra cargo adds to the vehicle’s overall weight, which increases fuel consumption. Remove items that you don’t need to carry regularly, such as sporting equipment or tools.

Consider using the “Eco” mode if driving conditions allow. This mode adjusts the throttle response and shift patterns to prioritize fuel efficiency. While it may slightly reduce performance, it can improve your overall MPG, especially during city driving.

Regular maintenance is critical. Ensure that your IS 300 receives scheduled maintenance, including oil changes and air filter replacements. A well-maintained engine runs more efficiently and consumes less fuel.