23 MPG combined is not the main reason someone buys a 2023 Lexus IS 350 with the 3.5L V6. This car exists for a specific buyer: someone who prioritizes engaging driving and traditional luxury over extreme efficiency. They want a naturally aspirated engine with a satisfying growl, not a hybrid powertrain tuned for maximum mileage. Fuel economy is a consideration, but it’s behind attributes like handling, reliability, and that Lexus badge.

City and highway performance

The EPA estimates for the IS 350 break down to 20 MPG in the city and 28 MPG on the highway. That city figure shows a larger engine working harder in stop-and-go conditions. The eight-speed automatic transmission does its best to optimize fuel usage, but the IS 350’s engine needs to work to deliver its characteristic punch. The highway number is more respectable and reflects the engine’s ability to cruise comfortably at higher speeds. A relaxed highway journey is within the IS 350’s comfort zone, just don’t expect hybrid-like numbers while doing it.

Annual Fuel Cost

The EPA estimates the annual fuel cost for the 2023 Lexus IS 350 at $2,500. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and assumes national average fuel prices. Your actual fuel costs may vary depending on your driving habits, the type of fuel you purchase (premium is recommended for optimal performance), and local gas prices. If you drive significantly more than 15,000 miles annually, or spend most of your time in heavy traffic, expect that number to climb.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy for the IS 350 often falls slightly below these figures. Aggressive driving, frequent short trips, and extended idling can all negatively impact fuel consumption. Owners who prioritize spirited acceleration and frequently tap into the engine’s power are likely to see numbers closer to the high teens in mixed driving. Conversely, those who adopt a more relaxed driving style and stick primarily to highway cruising may occasionally surpass the 28 MPG highway estimate. The sound and feel of that V6 are tempting, and using it carries a fuel penalty.

How it Compares

Compared to its rivals, the IS 350 sits in the middle of the pack for fuel economy. The BMW 330i, with its turbocharged four-cylinder engine, achieves a combined EPA rating of 28 MPG, making it more efficient. The Mercedes-Benz C300 posts similar numbers, also thanks to a smaller displacement, turbocharged powerplant. However, those cars don’t offer the same driving experience as the naturally aspirated Lexus V6. On the other hand, the Genesis G70 3.3T, with its twin-turbo V6, offers comparable performance but at a cost, achieving only 20 MPG combined. For those seeking maximum efficiency within the Lexus lineup, exploring all Lexus fuel economy data reveals hybrid options like the ES 300h, which boasts a remarkable 44 MPG combined. The IS 350 buyer understands these trade-offs and accepts the fuel consumption in exchange for the specific performance characteristics they desire. Perhaps they should also see IS MPG across all years to see if there are any differences they should be aware of depending on the year in question.

Tips to maximize efficiency

While the IS 350 prioritizes performance, there are still steps you can take to improve fuel economy without sacrificing too much driving enjoyment. Consistent maintenance is key. Ensure your IS 350 receives regular oil changes, air filter replacements, and tire pressure checks, all of which contribute to optimal engine efficiency. Neglecting these basic tasks can lead to decreased performance and increased fuel consumption.

Avoid aggressive acceleration and hard braking. The IS 350’s potent engine is tempting, but doing so frequently will dramatically reduce your MPG. Smooth, controlled acceleration and gentle braking help minimize fuel waste and keep you closer to the EPA estimates. Anticipating traffic flow and maintaining a steady speed can also contribute to fuel savings.

Use the available drive modes. The IS 350 typically offers multiple drive modes, including an “Eco” mode that prioritizes fuel efficiency. While it may slightly reduce throttle response and prioritize earlier upshifts, using Eco mode during routine commuting can help squeeze extra miles out of each tank of gas. Experiment to see if the trade-off in performance is acceptable for your daily driving needs.

Minimize idling time. Allowing your engine to idle for extended periods wastes fuel unnecessarily. If you’re waiting for someone or stopped for more than a minute, turn off the engine. Modern vehicles are designed to restart quickly and efficiently, so there’s little reason to idle for extended durations, especially in a performance-oriented car like this one.