22 MPG combined isn’t going to win any hypermiling contests, and no one shopping for a 2015 Lexus IS 350 expects it to. This is a car bought for its sharp handling, its smooth and potent V6 engine, and the Lexus badge. Fuel efficiency is a secondary, perhaps even tertiary, consideration for the driver who prioritizes performance and a well-crafted interior.

City and highway performance

The IS 350’s EPA estimates break down to 19 MPG in the city and 28 MPG on the highway. The city figure reflects the engine’s responsiveness and its tendency to encourage spirited driving. Stop-and-go traffic will certainly lower the average, especially if you’re enjoying the readily available power. The highway MPG is more respectable and achievable during steady-state cruising where the eight-speed automatic transmission can settle into its higher gears. Even on the open road, a heavy foot will quickly diminish the highway return. Drivers who frequently commute in dense urban environments should realistically anticipate averaging closer to the city MPG than the combined figure.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2015 Lexus IS 350 will be around $2,650. This calculation is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% on the highway, using national average fuel prices. Your actual fuel costs will vary depending on your driving habits, local fuel prices, and the type of fuel you use. Premium fuel is recommended for the IS 350, further increasing the potential cost at the pump.

Real-world expectations

Real-world fuel economy of the 2015 Lexus IS 350 depends on driving style. Owners often see figures ranging from the high teens to the low twenties in mixed driving. Consistently exceeding the EPA’s combined estimate requires a conscious effort to drive conservatively, anticipating traffic and avoiding aggressive acceleration. For those enjoying the car’s performance capabilities regularly, an average closer to 20 MPG is more likely. Understanding IS MPG across all years can help you anticipate your own results.

How it compares

The IS 350’s fuel economy positions it within its class. For example, the BMW 335i (produced until 2015) with its turbocharged inline-six engine yielded approximately 22 MPG combined. The Audi S4 with its supercharged V6 achieved a similar figure. The Infiniti Q50 with its optional 3.7L V6 hovered around 23 MPG combined. While there may be minor variations, these competitors generally occupy the same fuel economy ballpark. Buyers concerned about fuel efficiency in this segment often turn to alternative powertrains, such as the hybrid versions offered by Lexus (with significantly better MPG ratings), or opt for a smaller, less powerful engine like the 2.0L turbo found in other IS models or competing brands. Drivers should consider browsing all Lexus fuel economy data before deciding upon the IS 350.

Tips to maximize efficiency

Keep your tires properly inflated. The IS 350’s handling benefits from precise tire pressure, and it also directly impacts rolling resistance. Regularly check and maintain the recommended tire pressure listed on the driver’s side door jamb.

Use the car’s driving modes. The IS 350 typically features Eco, Normal, and Sport modes. Selecting “Eco” will dampen throttle response and optimize transmission shift points for fuel efficiency, especially useful in city driving.

Practice smooth acceleration and braking. The IS 350’s V6 is responsive, but aggressive acceleration and hard braking waste fuel. Anticipate traffic flow and maintain a consistent speed whenever possible.

Minimize idling time. Letting the car idle for extended periods consumes fuel without covering any distance. If you anticipate being stopped for more than a minute or two, turn off the engine.

Reduce unnecessary weight. Carrying excess cargo in the trunk adds weight, requiring the engine to work harder and consume more fuel. Remove any unnecessary items to improve fuel economy.