The national average for a gallon of gas dropped to $4.35 this week as crude oil prices eased amid reports of possible peace talks involving Iran. WASHINGTON — Gas prices appear to be easing a bit nationwide after weeks of increases, with the national average falling nearly 20 cents since a week ago as oil prices dropped amid reports of peace talks with Iran. AAA said the national average for a gallon of regular gasoline stood at $4.356 Saturday, down from $4.529 last Saturday. However, prices remain elevated compared to recent years as the busy summer driving season gets underway.…