Barchart - Sugar prices gave up an early advance on Friday and settled mixed. Friday's rally in the dollar index ($DXY) to a 3.5-month high weighed on sugar prices. Losses in sugar were limited on Friday amid speculation that this week's rally in crude oil prices (CLJ26) to a 3.75-year high will prompt Brazil to boost domestic gasoline prices, which could spur the country's sugar mills to divert more cane crushing toward ethanol production at the expense of sugar.