Pump prices are up slightly from last week, according to an Energy Information Administration report (link opens as PDF) released today.

Retail regular gasoline prices clocked in at a national average of $3.360 per gallon on September 21, $0.006 above last week's price tag. Rocky Mountain region prices dropped the most ($0.033), while the Gulf Coast saw a $0.022 increase in gas prices.

Compared to a year ago, pump prices are still $0.327 lower. 

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Source: EIA.gov 

For the same period, average retail diesel prices remained steady at a national average of $3.886 per gallon. On a regional basis, the Rocky Mountain region also made the deepest dip of $0.014, while the Gulf Coast added a slight $0.003 to per gallon prices .

Over the last year, diesel prices are down $0.230. 

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Source: EIA.gov 

At these latest prices, the West Coast pays the prettiest penny for gasoline ($3.655) and diesel ($4.049). On the other end, the Gulf Coast can guzzle gas for just $3.129, and diesel for $3.800 per gallon.

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