State officials say the cost of a gallon of home heating oil in Maine has dropped six cents in the past week to an average of $3.70. Still, the current price is 14 cents higher than at the same time last year. The Governor’s Energy Office reported Monday that the drop in heating oil and kerosene prices may be due to a projected surplus in global oil output for the last quarter of 2012. Decreased turmoil in the Middle East, combined with fewer transportation and production problems in some parts of the world, are considered to be factors. The lowest prices for heating oil were in the southwest of the state, where it averaged $3.63 per gallon. The highest prices were in the northern reaches, where the average was $3.84.