updated 7/13/2008 5:37:57 PM ET 2008-07-13T21:37:57

A national survey shows consumers across the nation are paying an average of 1.5 cents a gallon more for gasoline than they were three weeks ago.

The average price of regular gasoline at self-serve stations was $4.11 a gallon on Friday. Mid-grade was $4.24 a gallon and premium went for $4.35. That's according to the Lundberg Survey of 7,000 gas stations nationwide, released Sunday.

The survey showed the average U.S. price for gas is $1.05 higher than it was a year ago.

The cheapest gas was in Tucson, Ariz., where the price for regular was $3.82 a gallon.

San Francisco ranked the nation's highest for gas prices: $4.53 a gallon for regular. Prices rose slightly in all regions across the country, except the western states, where they were down.

Copyright 2008 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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