Reuters: Average US ethanol distillers profits were narrowly positive this week on soft input costs like those for corn and natural gas, but remained tough overall on weak fuel demand, analysts said. Prices for ethanol fell as oil refiners were unwilling to pay up as motorists were driving less than they did last year, a factor that has helped lead to some delays in the building of new ethanol plants. “Thin margins and lower prices for ethanol don’t help the bottom line of the …