Driver's license written test question bank, effective 2026-03-09

593. Which of the following is the most appropriate method of improving a vehicle’s fuel efficiency?

  1. ①Always fill up the fuel tank completely.
  2. ②When replacing engine oil, replace the oil filter and the air filter as well.
  3. ③When making a stop, step on the brake pedal once with strong force.
  4. ④Frequently use the accelerator and brake pedals.
Show the answer

Answer ②

The English PDF has no explanation for this question. The Korean page carries the official explanation. Korean version of this question

Source KoROAD Safe Driving Integrated Civil Service, Driver's License Written Test Question Bank [English] (effective 2026-03-09), post 1923, Download the source PDF source PDF page 173 (checked on 2026-09-04). The question and answer are the KoROAD text as published. The buttons and notes on this page were written by the developer and have not yet been checked by a native speaker. The questions and answers themselves are the official KoROAD text.