22 MPG combined is what Lexus IS 350 AWD buyers accept. They aren’t chasing hypermiling numbers; they’re seeking a distinct blend of engaging performance, all-weather confidence, and Lexus refinement. Fuel economy isn’t irrelevant, but it sits lower on the priority list than a responsive V6, a reliable all-wheel-drive system, and the Lexus badge. This isn’t a fuel-sipping hybrid; it’s a sports sedan offering a particular driving experience, and the MPG reflects that focus.

City and highway performance

The EPA estimates the 2018 Lexus IS 350 AWD at 19 MPG in the city and 26 MPG on the highway. These figures reflect the IS 350’s character. The city MPG acknowledges the stop-and-go nature of urban driving, where the engine works harder and the AWD system can contribute to increased fuel consumption. The highway MPG, while respectable, is still indicative of a naturally aspirated V6 that needs to rev to deliver its power. It’s fine for long-distance cruising but doesn’t prioritize outright efficiency on the open road. These aren’t shocking numbers, but they are a reality for anyone considering the IS 350 AWD’s specific performance and driveline configuration. Drivers interested in exploring IS MPG across all years should review older models to understand historical trends.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Lexus IS 350 AWD at $2,650. This is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price for premium gasoline, which is recommended for optimal performance in the IS 350’s engine. Remember, this figure isn’t a guarantee; your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices. Drivers with heavier feet or those who spend more time in city traffic can expect to exceed this estimate. It’s a benchmark, not a promise, and a cost you should factor into the overall ownership experience.

Real-world expectations

While manufacturer numbers provide a useful basis for comparison, real-world fuel economy can vary depending on driving style, road conditions, and vehicle maintenance. IS 350 AWD owners often see figures close to the EPA estimates, especially if they prioritize smooth acceleration and anticipate traffic flow. However, enthusiastic drivers who frequently exploit the V6’s power will likely experience lower MPG. Tire pressure, vehicle weight (passengers and cargo), and even weather conditions can play a role in the fuel economy you achieve.

Regular maintenance, including timely oil changes and air filter replacements, also helps to optimize fuel efficiency.

How it compares

Compared to its competitors, the IS 350 AWD’s fuel economy sits squarely in the middle of the pack. For example, a BMW 340i xDrive, with its turbocharged inline-six engine, typically achieves around 25 MPG combined, offering a slightly more efficient alternative with comparable performance. The Audi S4, another all-wheel-drive contender, can achieve similar numbers in real-world scenarios. A rear-wheel-drive IS 350 is rated for slightly better fuel economy. However, stepping up to larger luxury sedans like the Lexus GS 350 AWD reveals a similar fuel consumption, despite the GS offering more space and features. Those concerned about fuel costs should also review all Lexus fuel economy data to research other potential options.

Tips to maximize efficiency

Use premium fuel. Lexus recommends premium gasoline for the IS 350’s 3.5L V6, and while it might run on regular, you’ll likely see a slight dip in performance and fuel economy. Premium fuel is formulated to prevent knocking and ensure optimal combustion, which translates to better efficiency and performance. This is particularly important for a high-compression engine like the one in the IS 350.

Anticipate traffic and drive smoothly. The IS 350 benefits from a measured driving style. Avoid abrupt acceleration and braking, as these actions consume more fuel. Instead, anticipate traffic flow, maintain a safe following distance, and gradually increase or decrease your speed. This smooth driving style not only improves fuel economy but also enhances the overall driving experience.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Check your tire pressure regularly, ideally every few weeks, and inflate your tires to the recommended pressure listed on the doorjamb sticker. Proper tire pressure not only improves fuel economy but also prolongs tire life and enhances handling.

Avoid unnecessary idling. Letting the engine idle for extended periods wastes fuel. If you’re stopped for more than a minute, it’s more efficient to turn off the engine. Modern engines start easily and quickly, so there’s no need to let them idle unnecessarily. This is especially pertinent in urban environments where stop-and-go traffic is common.