The 2023 Lexus IS 500 gets 20 MPG combined, a figure that requires immediate context. This isn’t about efficiency; it’s about having a naturally aspirated 5.0-liter V8 in a world increasingly dominated by turbocharged four-cylinders. The IS 500 isn’t for Prius shoppers; it’s for enthusiasts who want visceral driving engagement and the unique sound of a high-revving V8, not fuel savings.

City and highway performance

The EPA estimates the IS 500 will achieve 17 MPG in the city and 25 MPG on the highway. These numbers reflect stop-and-go traffic and sustained high-speed cruising, respectively. The city figure shows how much harder the V8 works when repeatedly accelerating from a standstill. The highway MPG, while not great, hints at the engine’s relaxed nature when maintaining a constant speed. This car rewards a heavy foot, and frequent bursts of acceleration will decrease those numbers.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2023 Lexus IS 500 at $2,900. This is based on driving 15,000 miles per year, with a 55/45 split between city and highway driving, using the national average fuel price. If you regularly exploit the engine’s capabilities, you’ll likely exceed this estimate. Consider this cost a baseline, a starting point for budgeting your IS 500 ownership.

Real-world expectations

Real-world fuel economy varies according to driving style, traffic conditions, and even tire pressures. IS 500 owners who predominantly drive in densely populated urban areas should expect to average closer to the city estimate of 17 MPG, possibly lower in heavy congestion. Drivers with more predictable highway commutes might see numbers closer to 25 MPG or slightly above. However, if you restrain yourself from spirited driving, you can expect a number closer to 20MPG.

How it compares

The IS 500’s fuel economy compared to its competitors tells a clear story. The BMW M340i, with its turbocharged inline-six, achieves 26 MPG combined, a significant advantage. The Cadillac CT5-V, offering similar performance, gets an EPA-estimated 21 MPG combined. Even Lexus’ own IS 350, with its V6 engine, manages 23 MPG combined. This difference in fuel economy is the price IS 500 drivers willingly pay for the unique experience of a naturally aspirated V8. It’s a commitment to a specific type of driving pleasure that other cars simply don’t offer.

If you’re considering other Lexus models, you can view all Lexus fuel economy data. For a broader view of the IS model line, see IS MPG across all years.

Tips to maximize efficiency

The IS 500 isn’t designed to prioritize fuel efficiency, but there are ways to increase MPG without sacrificing too much driving enjoyment. Monitor your tire pressures regularly. Keeping tires properly inflated reduces rolling resistance, improving fuel consumption. Consult the sticker on your driver’s side doorjamb for the recommended pressure.

Anticipate traffic flow to avoid unnecessary acceleration and braking. Look ahead when driving to maintain a consistent speed and reduce fuel-wasting speed fluctuations. For example, if you see that a light ahead is red, begin to slow down early to avoid abrupt braking before it turns green.

Use the Lexus Drive Mode Select system wisely. While “Sport” and “Sport+” modes enhance throttle response and hold gears longer, they also consume more fuel. Choose “Normal” or “Eco” mode during less spirited driving to increase MPG whenever possible. Using “Normal” or “Eco” mode will reduce the aggressive nature of the engine.

Avoid extended idling. Modern engines are designed to operate efficiently even when started, so idling for more than a minute or two is generally unnecessary and wastes fuel. If you’re waiting for someone or anticipate a prolonged stop, turn off the car.

Consider using Top Tier gasoline. While the IS 500 does not require premium fuel, quality gasoline with proper detergents can help maintain a clean fuel system, optimizing engine performance and efficiency over the long term. Detergents in Top Tier gas can keep injectors clean, which helps with proper fuel delivery.