NEW YORK — Retail gas prices pushed past a record high $3.40 a gallon Thursday, fulfilling expectations that they'll keep climbing toward $4 as the summer driving season approaches.

Oil prices, meanwhile, fluctuated after setting yet another record high overnight. Crude rose to a new trading record of $115.54 overnight as the dollar fell to a new low against the euro but later pulled back to close at $113.85 a barrel on the New York Mercantile Exchange.

At the pump, the average national price of a gallon of unleaded gas rose 1.9 cents overnight to $3.418 a gallon, according to a survey of stations by AAA and the Oil Price Information Service. Diesel fuel also hit a new record of $4.146 a gallon after jumping 1.7 cents overnight, the survey said.