Tesoro (NYSE: TSO ) posted a weaker-than-expected fourth-quarter profit. Tesoro posted a quarterly profit of $27 million, or $0.19 per share, versus a year-ago loss of $124 million, or $0.89 per share. Excluding one-time expenses, Tesoro earned $1.34 per share. Its revenue climbed 7.3% to $8.27 billion. However, analysts were expecting