For some perspective on fuel costs, check this out:
The numbers, from top to bottom: car fuel (gasoline), truck fuel (diesel), and kerosene. Keep in mind that Korea uses the metric system. So: 1977 won = about $1.97. There are 3.78 liters in a gallon. 3.78 x 1.97 = $7.45.
About $7.50 for a gallon of gas.