The U.S. is staging airstrikes in Iraq, Russian troops are amassing on the Ukraine border and Israel and Hamas are at war. All three conflicts have the potential to threaten oil output. But investors and traders say they are worried less about oil supplies and more about soft demand. They have sent Brent crude, the benchmark for world oil prices, tumbling this week. Brent hit a 13-month low during intraday trading Wednesday before recovering to end at $104.28 a barrel. Prices have gradually ticked lower since mid-June, retreating more than 9%. The drop has helped bring relief at the pump for U.S. drivers, who are paying an average $3.47 for a gallon of regular gasoline, down from $3.62 a month ago, according to AAA. The most recent losses came after the International Energy Agency on Tuesday lowered its demand forecast for 2014, citing weaker-than-expected second-quarter economic growth in […]