Key Takeaways Petrobras plans a strategic re-entry into ethanol, with a growing focus on corn over sugarcane.Corn ethanol gains appeal from lower costs, higher yields and rising output in Brazil's north.Petrobras eyes minority stakes in corn ethanol ventures, while denying investment in Raizen.Petrobras (PBR) , Brazil’s state-run integrated oil and gas company, is signaling a bold shift in its ethanol strategy. According to Reuters, the company is increasingly favoring corn-based ethanol over the traditiona ...