The 2015 Lexus GS 450h achieves a combined fuel economy of 31 MPG. This is not just a good number for a mid-size luxury sedan, it’s a key reason why buyers choose this hybrid GS over the regular gasoline model. They accept some performance trade-offs to prioritize less gas without losing the Lexus premium experience. They appreciate the smooth blend of power and restraint that the 450h offers.

City and highway performance

The GS 450h shines in city driving, achieving an EPA-estimated 29 MPG. This comes from the car’s ability to frequently use its electric motor at lower speeds, which minimizes fuel use in stop-and-go traffic. On the open road, the GS 450h still gets impressive fuel economy, rated at 34 MPG on the highway. This is due to the efficient Atkinson-cycle engine and the hybrid system that optimizes power delivery for cruising speeds. This makes the GS 450h a good choice for those who split their time between urban commutes and longer highway journeys.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Lexus GS 450h is $1,850. This is based on driving 15,000 miles per year and using national average fuel prices. This cost will vary based on individual driving and fuel price changes. This number provides a standard for comparison when evaluating the GS 450h against competitors or other Lexus vehicles. Premium fuel is recommended for the GS 450h to maintain performance and efficiency, so the EPA’s “national average fuel price” is for premium unleaded.

Real-world expectations

EPA estimates provide a benchmark. Real-world fuel economy can vary. Aggressive driving, frequent acceleration, and heavy traffic can hurt fuel consumption. Smooth driving, consistent speeds, and strategic use of regenerative braking can help achieve or exceed the EPA estimates. Drivers report that with good habits, they can get fuel economy close to the EPA’s numbers, mainly in cities where the hybrid system can often run in electric mode. You can find more information on GS MPG across all years.

How it compares

The 2015 Lexus GS 450h’s fuel economy stands out in the luxury mid-size sedan class. The non-hybrid GS 350 averages around 23 MPG combined. Other hybrids in this class struggle to match the 450h’s efficiency. The Acura RLX Sport Hybrid, offers similar luxury and performance, but typically gets around 29 MPG combined. A BMW 535i from the same year, not a hybrid, achieves around 24 MPG combined. The GS 450h’s fuel economy will be appreciated by buyers who want less gas but don’t want to compromise luxury or performance. These consumers can see all Lexus fuel economy data in one place.

Tips to maximize efficiency

Take advantage of the GS 450h’s regenerative braking system. Anticipate stops and gently apply the brakes. The electric motor recaptures energy and recharges the battery. Hard braking wastes energy and reduces efficiency. Maximizing regenerative braking is key in this hybrid powertrain.

Use the “ECO” drive mode for everyday driving. This mode optimizes the car’s systems for fuel efficiency, softening throttle response and adjusting climate control settings. This may slightly reduce the car’s sporty feel, but it enhances efficiency a lot.

Keep proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure and inflate them to the recommended level. This is typically found on a sticker inside the driver’s side door jamb panel.

Avoid unnecessary idling. If you anticipate being stopped for more than a minute, turn off the engine. The hybrid system allows for quick restarts, saving fuel and reducing emissions. The electric motor can handle short waits with the gasoline engine off.

Minimize aerodynamic drag. Remove any unnecessary items from the roof rack or cargo carrier. These increase wind resistance and reduce fuel economy. A clean exterior can help fuel efficiency, especially on the highway.