21 MPG combined isn’t going to win the 2020 Lexus IS 300 AWD any fuel-sipping awards, but that’s hardly the point of this particular vehicle. This is a sporty, stylish, and supremely reliable compact luxury sedan with all-weather capability thanks to its all-wheel drive system. Owners choose it for its comfortable ride, upscale interior, and the undeniable cachet of the Lexus badge, fuel economy is often a tertiary concern, at best.

City and highway performance

The EPA estimates for the 2020 Lexus IS 300 AWD with the 3.5L V6 show a difference between city and highway driving. In the city, drivers can expect around 18 MPG, a figure that reflects the stop-and-go nature of urban driving and the engine’s need to work harder from a standstill. Once you’re on the highway, that number climbs to 24 MPG. This improvement is due to the steadier speeds and reduced demand on the engine, allowing the six-speed automatic transmission to settle into its most efficient gear. Understanding these differences helps owners tailor their driving habits to potentially squeeze a bit more efficiency out of each gallon.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Lexus IS 300 AWD at $2,750. This calculation is based on driving 15,000 miles per year, using national average fuel prices. Individual costs will vary depending on your driving habits, the type of fuel you use (premium is recommended), and where you live, as fuel prices fluctuate regionally. However, $2,750 provides a standard benchmark against which to compare this Lexus to other vehicles in its class. For those interested in researching all Lexus fuel economy data, resources are readily available.

Real-world expectations

EPA estimates provide a guideline, and real-world fuel economy often varies. Aggressive acceleration, frequent short trips, and sustained high speeds can all negatively impact MPG. Conversely, gentle driving, maintaining a steady pace, and using cruise control on the highway can improve fuel efficiency. Achieving the EPA-estimated numbers, or even exceeding them, depends on the driver’s habits. Owners who prioritize fuel economy can certainly influence the IS 300 AWD’s performance at the pump.

How it compares

The 2020 Lexus IS 300 AWD’s fuel economy lags behind some of its competitors, particularly those with turbocharged four-cylinder engines or hybrid powertrains. For instance, the BMW 330i xDrive, with its turbocharged 2.0L four-cylinder, achieves a combined 28 MPG. Even the Audi A4 quattro, also with a turbocharged 2.0L, manages around 27 MPG combined. This difference matters to some buyers, who may be willing to sacrifice a bit of performance or the Lexus’s trademark smoothness for better mileage. However, those who prioritize the IS 300 AWD’s V6 engine and reputation for reliability may find the trade-off acceptable. Those focused primarily on efficiency might want to review IS MPG across all years to see how different powertrains compare.

Tips to maximize efficiency

The 2020 Lexus IS 300 AWD benefits from smooth, gradual acceleration. Avoid abrupt starts and stops, as these actions consume disproportionately more fuel. Anticipating traffic flow and maintaining a consistent speed are key to optimizing fuel economy in city driving.

Make sure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Check your tire pressure regularly and inflate them to the recommended pressure listed on the driver’s side doorjamb.

Minimize the use of accessories like air conditioning, especially during short trips. The A/C compressor puts a significant load on the engine, reducing fuel economy. When possible, use the ventilation system or open windows instead, particularly at lower speeds.

Consider using a fuel additive specifically designed to clean fuel injectors. A clean fuel system ensures optimal combustion and can help maintain fuel efficiency. Follow the manufacturer’s instructions for the recommended dosage and frequency of use.

Regular maintenance is critical for optimal fuel economy. Make sure that your engine is properly tuned, and that air filters are clean. A well-maintained engine operates more efficiently and consumes less fuel.