How does Toyota’s Hybrid Synergy Drive contribute to efficiency?

• A. It uses only the gasoline engine with no electric assistance
• B. It seamlessly blends power from the gasoline engine and electric motor, then recharges the battery through regenerative braking and engine output
• C. It relies on plug-in charging to recharge the battery
• D. It uses solar charging to power the system

Answer: (B)

The main concept is how a hybrid system uses both the gasoline engine and electric motor to boost efficiency. Toyota's Hybrid Synergy Drive coordinates the two power sources so the car can be propelled by the engine, the electric motor, or a combination of both, letting the engine run in its most efficient range and the electric motor assist during acceleration. The system also recovers energy that would otherwise be wasted: during braking or coasting, the electric motor acts as a generator and stores energy in the high‑voltage battery, which can later power the electric motor or support the engine. This energy isn’t obtained from plugging in; instead, the battery is charged by the engine output and regenerative braking, making the vehicle more fuel-efficient without requiring external charging. Solar charging isn’t part of the standard Hybrid Synergy Drive, and relying solely on the gasoline engine would miss the efficiency gains from electric assistance. So the best description is that the system seamlessly blends power from both sources and recharges the battery through regenerative braking and engine output.