(EnergyAsia, June 2) — High oil prices slashed Japan’s April customs-cleared trade surplus by 10.4% from a year earlier to 962.8 billion yen, said the Finance Ministry. (US$1=107 yen). Oil futures rose to a record US$58 a barrel in April. Exports rose 7.8% to 5.507 trillion yen, their second highest level on record while imports…