Gas prices continue to fluctuate, and on Sunday the national average for a gallon of regular stood at $3.10. That’s about a 3-cent increase in the past week. Last Sunday, it stood at $3.07. According to AAA, gas is a bit more expensive here in Pennsylvania, where a gallon of regular on Sunday was selling for an average $3.35. A week ago, the average price in Pennsylvania was $3.34. The average price yesterday in Lewistown was $3.31.