The national average price per gallon of diesel gasoline increased for the second week in a row, according to data issued today by the Department of Energy’s Energy Information Administration (EIA). With a 3.2-cent increase, the national average, for the week of September 8, came in at $3.766. following a 2.6-cent increase, to $3.734, for the week of September 1, and hitting its highest weekly average since the week of July 28, at $3.805. Which was preceded by 0.005-cent decline, to $3.708, for the week of August 25. On an annual basis, the national average increased 21.1 cents, topping the 10.9-cent increase, for the week of September 1.