RIO DE JANEIRO—Brazil’s state-run oil and gas company, Petróleo Brasileiro SA, PETR4.BR +1.37% Petroleo Brasileiro S/A Pref Brazil: Bovespa R$ 18.49 +0.25 +1.37% Oct. 25, 2013 5:08 pm Volume : 30.11M P/E Ratio 8.82 Market Cap R$232.34 Billion Dividend Yield N/A Rev. per Employee R$3,448,640 10/25/13 Petrobras Weighs New Mechanism… 10/22/13 Brazil Seen Having to Modify O… 10/22/13 Chinese Hunt for Oil in Brazil… More quote details and news » PETR4.BR in Your Value Your Change Short position is taking steps to stem huge losses on sales of gasoline and diesel that have raised questions about its ability to implement a huge investment program. On Friday, the company’s chief executive, Maria das Graças Silva Foster, wrote in a letter to shareholders that the board of directors has been presented with a new way of calculating prices that will have a “beneficial effect” in terms of bringing domestic fuel prices […]