(EnergyAsia, September 25, Tuesday) — Korean refiner GS Caltex plans to start up its newly completed 55,000 barrels per day (b/d) heavy oil upgrading plant next month. (US$1=920 won).The 1.5-trillion-won plant converts lower-cost low-quality heavy crude, bunker and fuel oil into higher-margin gasoline and jet fuels.South Korea’s second largest refiner estimates the price gap between…