WASHINGTON, D.C. --- Average U.S. retail diesel prices continue to tumble. Falling for the third consecutive week, they fell 10.1 cents to $4.502 per gallon, according to an Energy Department weekly report released Aug. 6.

But even with the cumulative drop of more than 26 cents from the all-time high set July 14, the average diesel price remained $1.604 higher than a year ago, the department's Energy Information Administration (EIA) reported.

On the East Coast, the average diesel price fell 10.1 cents to $4.563 per gallon, while the price in the Midwest remained the lowest of any region, retreating 9.9 cents to $4.419 per gallon. The average price in the Gulf Coast plunged 12 cents to $4.45 per gallon.

Once again, the price drop in the Rocky Mountains was the smallest for any region, slipping 5.2 cents to $4.605 per gallon.

The West Coast price fell 10.2 cents to $4.664 per gallon. In California, the average diesel price was $4.781 per gallon, a decrease of 8.8 cents.