22 MPG combined might not raise eyebrows in an era of hybrids and small displacement turbos, but for the 2026 Lexus IS 350 AWD 3.5L 6-cylinder, it’s a perfectly respectable figure that aligns with its mission. This isn’t a car engineered to chase segment-best fuel economy, it’s a compact luxury sport sedan focused on engagement, refinement, and bulletproof reliability, all while offering the confidence of all-wheel drive, especially important for its target demographic in colder climates. The buyer of an IS 350 AWD appreciates the accessible performance of a naturally aspirated V6, the polished road manners, and the singular design language that sets it apart from its German rivals. They value the Lexus ownership experience, and for them, the steady 22 MPG combined is an understandable trade-off for the car’s character and proven powertrain.

City and highway performance

Delving deeper into the EPA ratings, the 2026 IS 350 AWD achieves 19 MPG in city driving and 26 MPG on the highway. That 19 MPG in the city reflects the inherent characteristics of a 3.5-liter V6 engaged in stop-and-go traffic, particularly when paired with all-wheel drive, which adds both weight and driveline friction. While not class-leading, it’s competitive for a traditionally-powered luxury sedan in this segment. The highway figure of 26 MPG is where the car shines more, allowing the smoother operation of the V6 to settle into a rhythm. Long cruises are comfortable and quiet, and the 26 MPG paints a realistic picture for those who spend significant time on open roads. It’s a powertrain that really comes alive when stretched, offering a linear power delivery that turbos often struggle to replicate. The S6 automatic transmission, while not the most gear-heavy on the market, is calibrated for smooth shifts and contributes to the car’s overall refined demeanor rather than aggressive fuel saving.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,650 for the 2026 Lexus IS 350 AWD 3.5L 6-cylinder. This figure is based on an assumption of 15,000 miles driven per year, split between city and highway conditions, and using national average fuel prices. It’s a useful benchmark for buyers to understand the potential yearly expenditure on premium gasoline. For the typical IS buyer, someone who likely owns their vehicle for an extended period, this predictable annual cost is just another facet of the Lexus ownership experience. While fuel costs are always a consideration, the buyer prioritizes the car’s intrinsic value, including its renowned reliability and lower maintenance costs compared to some European competitors, over chasing marginal fuel savings.

Real-world expectations

In real-world driving, owners of the 2026 IS 350 AWD should expect fuel economy figures very close to the EPA estimates. Lexus has a long history of conservative EPA ratings that are generally achievable. Drivers with a heavy right foot, particularly in urban environments, might see city figures dip slightly below 19 MPG, but disciplined driving can yield results at or even slightly above the stated numbers. Conversely, long, steady highway cruises, especially at moderate speeds, could push highway efficiency closer to 27 or 28 MPG. The car’s 3.5-liter naturally aspirated V6 offers predictable performance without the dramatic swings in fuel economy that can sometimes accompany turbocharged engines under varying load conditions. For a specific look at how this model performs across different generations, check out IS MPG across all years.

How it compares

Placing the 2026 Lexus IS 350 AWD within its competitive set reveals its position as an engaging, traditionally-powered luxury sport sedan rather than an outright fuel sipper. Take for instance the BMW 330i xDrive, a key rival. That car, with its 2.0-liter turbocharged four-cylinder, typically achieves around 28 MPG combined (23 City / 33 Highway). The IS 350 AWD’s 22 MPG combined is indeed lower. However, step up to the more comparable BMW M340i xDrive, with its turbocharged inline-six, and its combined rating hovers around 25 MPG (23 City / 31 Highway). This shows the Lexus isn’t drastically out of line when comparing six-cylinder, all-wheel-drive performance sedans. The Acura TLX SH-AWD with its 2.0-liter turbo-four typically delivers 24 MPG combined (21 City / 29 Highway) and its Type S variant, equipped with a turbo V6, comes in around 21 MPG combined (19 City / 25 Highway). The Cadillac CT4-V Blackwing, a higher performance tier, offers much lower figures. The IS 350 AWD carves out its niche by offering a naturally aspirated V6, something increasingly rare, providing a distinctly linear and refined power delivery that many enthusiasts still prefer, accepting the modest fuel economy trade-off. For those wanting to explore the full range of Lexus’s commitment to efficiency and performance, all Lexus fuel economy data is readily available.

Tips to maximize efficiency

Maintaining consistent throttle input is key with the IS 350 AWD. The V6 delivers its power smoothly, so avoiding sudden acceleration and deceleration instances will help keep the automatic transmission from frequently downshifting and burning more fuel unnecessarily.

Regular maintenance, including proper tire inflation and timely oil changes, directly impacts efficiency. An underinflated tire creates more rolling resistance, forcing the engine to work harder than necessary for the same speed.

Use the car’s Eco drive mode. While the IS is a sport sedan, Eco mode can subtly adjust throttle response and transmission shift points to prioritize fuel savings during less aggressive driving scenarios, especially in heavy traffic.

Plan your routes to avoid excessive idling and stop-and-go traffic when possible. The 19 MPG city rating is indicative of how much more fuel the engine consumes when constantly accelerating and braking, so smoother traffic flows are your friend.

Mind your highway speed. While 26 MPG is good for this powertrain, aerodynamic drag increases exponentially with speed. Driving consistently at 65-70 MPH rather than 80 MPH can noticeably improve your long-distance fuel economy.