- With fuel economy ratings of 35/34/35 (City/Highway/Combined), the HS 250h is 50% more fuel efficient than its near luxury competitors. An example of the impact of these savings is shown below:
- The HS has earned a Super Ultra-Low Emissions Vehicle (SULEVII) rating, meaning it emits 70% fewer smog-forming emissions than the average new car. It is also 8 times cleaner than any clean diesel
- Efficiency is further enhanced by the Electronically-Controlled Continuously Variable Transmission (ECVT). Unlike typical automatic transmissions that have a fixed number of gear combinations, the hybrid's ECVT allows for virtually unlimited combinations, maximizing the powertrain's efficiency and allowing the driver to enjoy smoother acceleration than is possible with conventional transmissions
- The 2010 HS 250h features an Exhaust Heat-Recovery System which reduces engine warm-up time, thus allowing it to stop earlier, more often, and for longer periods. This feature alone accounts for as much as a 7% increase in fuel efficiency at low temperatures. An additional benefit is that the cabin will heat up more quickly during cold starts
- The HS features a regenerative braking system that captures excess energy when the vehicle is decelerating or braking; this energy is converted to electric energy for recharging the battery which is used to power the vehicle. An added benefit of this technology is decreased brake wear, allowing customers to save on maintenance throughout the life of the vehicle compared to its competitors
Eco mode – Increases fuel mileage by seamlessly reducing accelerator inputs and reducing air conditioning load. Under full throttle conditions, power is not reduced
Power mode - Emphasizes responsive acceleration performance
EV mode - Allows the vehicle to be driven up to 23 MPH using only the electric motors, with an emphasis on quietness while reducing emissions. Under ideal conditions, this system will allow the vehicle to travel over one mile under electric power. Once the battery is drained, the vehicle will automatically return to normal mode
- To make efficient driving easier, a hybrid power meter shows instantaneous eco-driving status, while a green ECO indicator light rewards you when you are driving efficiently












