How Toyota and Lexus Improved the Efficiency of Electrified Vehicles

[Fuel Efficiency AtoZ] Lexus and Toyota Electrified Models

The Lexus RZ, introduced domestically last June, is the brand's first dedicated electric vehicle. It represents the starting point of the new direction set in line with the electrification transition. Based on a dedicated platform, it features packaging optimized for electric vehicles. The battery and rear motor are positioned low to enhance stability at high speeds. This layout also allows for a spacious interior and trunk. The front and rear wheels are equipped with a newly developed Direct4 all-wheel-drive system featuring a dual-axle.

The vehicle aims for weight reduction through various materials and technologies. At the same time, the battery is integrated into the body, and structural reinforcements are applied to key areas to increase body rigidity. It is the first to apply a 71.4 kWh lithium-ion battery designed specifically for pure electric vehicles and a self-developed silicon carbide (SiC) inverter. It can travel up to 377 km on a single charge, with a total system output of 312 horsepower. The exterior design features an aerodynamic silhouette.

Lexus RZ

Launched alongside the RZ, the new RX is a mid-size sport utility vehicle (SUV) with a solid domestic demand base. The RX, first introduced with a hybrid model in 2006, is considered a pioneer in electrified vehicles. The domestically released model is the 5th generation, reflecting the brand’s electrification direction. It is available in three variants: RX350h, plug-in hybrid RX450h+, and high-performance RX500h F Sport Performance.

The RX350h combines a 2.5L 4-cylinder naturally aspirated gasoline engine with a high-efficiency hybrid system, delivering 249 horsepower and fuel efficiency of 13.6 km per liter. The RX450h+ uses the same 4-cylinder engine paired with an 18.1 kWh lithium-ion battery, producing 309 horsepower. It can travel 56 km in electric mode on a single charge, with a combined fuel efficiency of 14.0 km/L.

The electric RZ is offered in two trims: Supreme and Luxury, priced at 84.9 million KRW and 93 million KRW respectively (including VAT, based on 5% individual consumption tax, same below). The RX is priced at 98.7 million KRW for the 350h Luxury, 100.93 million KRW for the 450h+, and 117.03 million KRW for the 500h F Sport Performance.

Toyota Crown Dual Boost Hybrid

Also introduced domestically in June, the Crown is Toyota’s flagship sedan. Now in its 16th generation, this historic model underwent significant changes during the development of the new vehicle. The domestically released Crown is a hybrid model featuring a bipolar nickel-metal battery that maximizes the output of each battery cell.

Unlike conventional batteries that use terminals to conduct current between cells, this design directly connects the entire surface of each cell. This reduces the number of components, thereby decreasing weight and volume. The company explains that because current is directly transmitted between cells, internal electrical resistance is reduced, allowing electricity to move at a higher speed, which contributes to both higher output and improved fuel efficiency. The Crown is priced at 57.5 million KRW for the 2.5L hybrid and 65.79 million KRW for the 2.4L dual-boost hybrid.