24 MPG combined is the fuel economy you can expect with the 2015 Lexus IS 250 C, and it’s a figure that should be considered in context. This car isn’t about maximum fuel savings; it’s about enjoying open-air driving with Lexus refinement. Buyers of this car want style and the experience of a retractable hardtop convertible, and may accept slightly lower fuel economy to get it.

City and highway performance

The IS 250 C gets an EPA-estimated 21 MPG in the city and 30 MPG on the highway. The city figure reflects typical stop-and-go driving, where the 2.5L V6 engine works harder. The highway number suggests decent fuel economy is possible on longer trips. The six-speed automatic transmission helps achieve the highway MPG, allowing the engine to cruise at lower RPMs.

Annual fuel cost

The EPA estimates annual fuel costs for the 2015 Lexus IS 250 C at $2,400. This is based on driving 15,000 miles per year and using national average fuel prices. This can change based on gas prices and your driving habits. Drivers who are frequently in stop-and-go traffic will likely see a higher fuel bill than those who primarily drive on the highway.

Real-world expectations

The EPA estimates provide a baseline, but real-world fuel economy often differs. Factors like driving style, traffic, and tire pressure can impact your car’s MPG. Drivers who accelerate quickly will likely see lower numbers. The IS 250 C has performance driving modes, and using these modes will affect gas mileage. It’s a good idea to track your own fuel consumption to get a more accurate picture of what to expect.

How it compares

The IS 250 C’s fuel economy places it between style and efficiency compared to its competitors. The BMW 328i convertible from the same year, with its turbocharged 4-cylinder, often achieves slightly better MPG, around 23 MPG combined. The Audi A5 Cabriolet is another option and delivers numbers in a similar range, sometimes a bit higher. These differences may not be that important to IS 250 C buyers, who aren’t only thinking about saving money on gas. A hybrid or a smaller, less performance-focused vehicle might be a better option for someone who is heavily focused on fuel savings. For all all Lexus fuel economy data, explore our resources.

Tips to maximize efficiency

Smooth driving helps the IS 250 C achieve better fuel economy. Rapid acceleration and hard braking waste fuel. Anticipate traffic and maintain a steady speed when you can. This means driving carefully.

Make sure your tires are properly inflated. Underinflated tires increase rolling resistance, making your engine work harder and reducing fuel economy. Check your tire pressure often and inflate to the recommended level on the driver’s side door jamb.

Reduce the weight you’re carrying. Remove any unnecessary items from the trunk or backseat. Extra weight puts strain on the engine, increasing fuel consumption. Every pound matters, so declutter your car regularly.

Use premium fuel. The IS 250 C’s engine performs best with premium gasoline, though it is not explicitly required. Higher octane fuel can sometimes improve efficiency slightly, especially under demanding driving conditions, and can help prevent engine knocking. Check the IS MPG across all years to compare how fuel ratings may have changed.