For the fifth straight week, the average national price for a gallon of diesel fell - this time by a whopping 14 cents, to $2.713, for the week ending Sept. 17, according to the Energy Information Administration. It topped last week's 11-cent plunge and also was 1.9 cents lower than it was for the same week last year.
All regions featured a double-digit decline in prices, with the largest drop coming in the Rocky Mountains -- 18.4 cents to $3.052, which remains the most expensive region in which to fill up. The Central Atlantic region had the lowest fall -- 11.4 cents to $2.844. The Midwest, which experienced a 16.3-cent drop, was the cheapest region.