The taxi described is a V-6 engine vehicle, which the narrator considers suitable for their needs. They decide to turn off the radio and air conditioning to conserve energy and ensure maximum power from the engine, indicating a focus on performance or urgency.
"Good, I'd probably need all of that" reflects the narrator's awareness of the importance of the vehicle's power in their situation. These actions suggest a tense or critical moment where every bit of power and focus counts.