Triple A reports pump prices continue their mid-summer slide, despite world problems. Gasoline prices continued to tick lower last week due primarily to lower crude oil prices as the situation stabilizes in Iraq. The national average at $3.59 per gallon Friday is the lowest since April 8. Virginia was 3.39, Richmond 3.35, compared with 3.49 this time last year. Triple A says prices should continue to slide or remain flat in the near future, barring any geopolitical concerns, major hurricane or refinery disruptions.