What vehicle feature helps improve fuel efficiency during acceleration?

Turbochargers significantly improve fuel efficiency during acceleration by forcing more air into the engine's combustion chamber. This additional air allows for a more efficient combustion process, enabling the engine to produce more power without requiring a proportional increase in fuel consumption. As a result, a turbocharged engine can deliver higher performance while using less fuel, particularly during acceleration when demand for power increases.

In contrast, air filters, while important for maintaining clean air entering the engine, do not directly enhance fuel efficiency during acceleration. Fuel injectors are crucial for delivering the right amount of fuel into the engine, but they do not inherently boost efficiency like turbochargers do. Exhaust systems help manage engine emissions and sound but play a minimal role in directly affecting fuel efficiency during acceleration.