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For Apex Transport’s new vehicles, how does using an exhaust brake retarder impact fuel efficiency?

Vehicle safety features (LGV CPC)
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Decreases engine temperature
Increases fuel consumption
Increases engine braking and atomises fuel more efficiently
Reduces engine braking
← Considering Apex Transport's fleet upgrade, why are supplementary systems like retarders essential in their large goods vehicles? In the context of Greenway Logistics' new fleet, what increases a large goods vehicle's kinetic energy, necessitating greater force to stop it? →

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