The 2015 Lexus IS 250 2.5L 6-cyl gets 24 MPG combined, a number that requires context. This isn’t a hybrid or a compact economy car. It’s a Lexus IS, a luxury sedan for buyers who value a smooth, refined driving experience and the Lexus brand, even if it means accepting adequate fuel efficiency. The IS 250 prioritizes a comfortable ride and a carefully designed interior over class-leading gas mileage. This choice defines its target audience.

City and highway performance

The EPA estimates the IS 250 achieves 21 MPG in city driving and 30 MPG on the highway. These numbers, derived from standardized testing, provide a useful benchmark. The city figure reflects the demands on the 2.5L V6 engine in stop-and-go traffic, where repeated acceleration takes its toll. The highway MPG is more respectable, showcasing the engine’s ability to cruise efficiently at steady speeds. Drivers with longer commutes or more time on the open road will see economy closer to this higher figure.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2015 Lexus IS 250 at $2,400. This figure is based on driving 15,000 miles per year and using the national average fuel price. Fuel prices fluctuate based on location and time of year, so this is just an estimate. Individual driving habits also play a major role; an aggressive driver will likely exceed this annual cost, while a more conservative driver who carefully monitors their speed and acceleration may see lower expenses. It’s a data point to consider.

Real-world expectations

While the EPA estimates provide a good starting point, real-world fuel economy often varies. Some drivers report figures slightly below the EPA estimates, particularly in combined driving. Traffic conditions, driving style, tire pressure, and even air conditioning can impact fuel consumption. The IS 250, with its smooth-revving but not particularly torque-rich V6, encourages some drivers to use more gas, which explains some of the variance. Those interested in seeing IS MPG across all years should research owner forums and other independent sources to develop a more realistic picture based on user experiences.

How it compares

In the luxury sedan segment, the 2015 IS 250 competes with others with different fuel efficiencies. A similarly equipped BMW 328i (turbo 4-cylinder) offers significantly better fuel economy – around 27 MPG combined. The Acura TLX with the V6 engine manages around 25 MPG combined. Even some larger sedans, like the Infiniti Q50 with its base engine, can match or slightly surpass the IS 250’s fuel economy. The IS 250 buyer is likely aware of these tradeoffs but chooses the Lexus for its reputation for reliability, comfortable ride, and distinctive styling, accepting the less impressive MPG as a consequence. For those prioritizing fuel efficiency within the Lexus brand, exploring all Lexus fuel economy data might uncover suitable alternatives like the IS 300h hybrid.

Tips to maximize efficiency

The IS 250 is not inherently fuel-efficient, but owners can take steps to improve their MPG. Avoid aggressive acceleration and hard braking, as the V6 engine responds poorly to sudden demands for power, resulting in a significant dip in fuel economy. Maintain a steady speed on the highway, using cruise control where appropriate.

Regular maintenance is critical. Ensure the tires are properly inflated to the recommended pressure, as underinflated tires increase rolling resistance and reduce fuel economy. And follow the manufacturer’s recommended service schedule, including oil changes and air filter replacements, to keep the engine running smoothly and efficiently.

Minimize idling time. If you anticipate stopping for more than a minute or two, it’s generally more fuel-efficient to turn off the engine rather than let it idle. Excessive idling consumes fuel without covering any distance, significantly impacting overall MPG.

Consider using a fuel additive designed to clean fuel injectors. Over time, deposits can build up in the fuel injectors, reducing their efficiency and impacting fuel spray patterns. Using a quality fuel additive periodically can help keep the injectors clean and maintain optimal fuel atomization.