Gas prices are on the rise again. Here's where experts say they are going next.

Budget-conscious motorists may want to fill up sooner rather than later, as prices at the pump are likely headed higher in the near term. The approach of the peak driving season and the annual switch by refineries to more costly summer gasolines has driven up the national average for unleaded to $3.63, according to AAA. Prices have been edging higher, with motorists on average paying six cents more per gallon than a week ago and 23 cents more this time last month. Still, the cost of filling up is in...