Japan Post Service Co will convert all of its fleet of some 20,000 automobiles to electric vehicles over about eight years starting this fiscal year, company officials said Monday. The move by the mail delivery unit of Japan Post Holdings Co is designed to cope with soaring crude oil prices and to reduce greenhouse gas emissions, the officials said. In the fiscal year that ended in March, the company used some 70,000 liters of gasoline, costing over 10 billion yen.