Gasoline prices continue climbing. The national average for a gallon of regular now stands at anywhere from $3.88 to $3.91. Here at home, the cost of a gallon of regular rose 30-cents since yesterday to $3.99. In California, where prices are the highest in the country, drivers are paying $5.61 a gallon on average. The recent surge in gasoline prices is primarily driven by the conflict with Iran, which has disrupted global oil supply and shipping.