What is the gas mileage on a Lexus is 300h?
The Lexus IS 300h typically delivers around 4.2–4.8 L/100 km in official testing, which translates to roughly 50–65 mpg depending on whether you measure with US or UK gallons. Real-world results often fall in the 40–60 mpg range.
How the IS 300h achieves efficiency
The IS 300h is Lexus’s mid-size hybrid sedan that combines a 2.5-liter inline-four petrol engine with an electric motor. The system runs with an Atkinson-cycle engine and a continuously variable transmission (CVT) to optimize fuel use. The hybrid setup allows the car to run on electric power at low speeds and switch to petrol mode as needed, recycling energy through regenerative braking.
Technical specifications
- Engine: 2.5-liter Atkinson-cycle inline-four
- Hybrid system: electric motor integrated with a continuously variable transmission
- Total system output: around 223 horsepower
- Drivetrain: front-wheel drive (standard); all-wheel drive was not commonly offered
- Fuel economy: official figures vary by market; typically around 4.2–4.8 L/100 km (WLTP/NEDC in older cycles), corresponding to about 50–65 mpg depending on the measurement system
These figures reflect the markets where the IS 300h was sold—primarily Europe, parts of Asia, and Australia. Availability in the United States was limited, and official EPA numbers for a new IS 300h were not consistently published where the model was not widely offered.
The figures above illustrate typical efficiency ranges for the IS 300h across markets. Actual results will vary with cycle and driving style.
Real-world performance and tips to improve mileage
Real-world fuel economy depends on driving conditions, climate, and how you drive. Hybrid behavior—like smooth acceleration, steady cruising, and careful braking—can push you closer to the official numbers. Environmental factors such as heavy traffic, hillier terrain, and cold starts typically reduce mpg.
- Drive smoothly: gradual acceleration and gentle braking maximize the hybrid system’s efficiency.
- Maintain steady speeds on highways to let the hybrid system optimize energy use.
- Use eco or hybrid modes if your market offers them, to prioritize efficiency over performance.
- Keep tires inflated to the recommended pressure to reduce rolling resistance.
Real-world mpg often trails official figures by roughly 10–20 percent, depending on conditions and habits. For buyers, this means expecting a practical range rather than a fixed number.
Availability and market context
The IS 300h was primarily sold in European, Asian, and Australian markets. In some regions, Lexus phased out this model in favor of newer hybrid designs and plug-in options. If you’re shopping today, check with local dealers about current hybrid options in the IS lineup and the exact mpg figures published for your year and trim.
Summary
The Lexus IS 300h offers solid hybrid efficiency for a mid-size sedan, with official figures typically around 4.2–4.8 L/100 km and real-world results commonly in the 40–60 mpg range depending on driving style and conditions. Availability varies by market, and newer Lexus hybrids have largely replaced this model in many regions. For precise mileage for a specific car, consult the official window sticker or the dealer’s published data for that year and market.
