Tucson average drops five cents in a week, AAA says.
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Tucson kept the state's lowest average gas price.
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State average price falls more than a nickel in a week, AAA says.
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But prices rose nationally this week, according to AAA.
Low crude-oil prices and ample supplies send gas prices down.
They edge down for sixth week in a row.
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Arizona motorists saw gas prices fall this week, even as prices edged up nationally, according to AAA Arizona.
Trend attributed to flattening crude-oil costs, refinery gains.
Surprise recognition goes to Barbara Whitney.
Arizona is in top 10 for annual gas savings, AAA says; and other local news.
Arizona's average gas price falls 3 cents in a week, AAA says.
Calif. refinery explosion could further pressure prices, AAA says.
Tucson's average dipped 8 cents in a week.
Five of nine Arizona metro regions AAA monitors have dipped below the $2 mark.