MANILA (AFX-ASIA) – Petron Corp said its net profit rose to 1.28 billion pesos in the first half to June, from the year-earlier 1.23 billion, as sales revenue increased 31.7% year-on-year. (US$1=54 peso). Petron said its domestic market share expanded to 39.1% as at end-June from 38.2% at end-2002. The country’s largest oil refiner, which…