Gas prices post 3rd straight record
National average gas price sets all-time high of $4.092 a gallon. Alaska has the most expensive gas at $4.649 a gallon.
NEW YORK (CNNMoney.com) -- Retail gas prices have risen to an all-time high for the third straight day, according to a survey from motorist group AAA.
The national average price for a gallon of regular gas rose five-tenths of a cent overnight to $4.092, the daily survey showed Wednesday. That tops the previous day's record of $4.087 a gallon.
Gas prices are now about 3% higher than last month and 38.5% higher than year-ago levels.
Alaska has the highest gas prices. Drivers in the state pay an average of $4.649 a gallon for regular gas. California has the second-highest gas prices, averaging $4.578, followed by Hawaii at $4.446.
The lowest gas prices in the nation can be found in Oklahoma. The state has an average price of $3.878 a gallon.
The survey also showed that the national average price for diesel fuel rose to $4.767 from $4.762 the day before. Diesel prices are highest in Hawaii, where the average price is a whopping $5.347 a gallon.
Rising gas prices contributed to a sharp decline in June auto sales. Unadjusted sales fell 18%, far worse than the 12% decline forecast by sales tracker Edmunds.com,
Despite the rising popularity of fuel-efficient cars, sales of fuel sippers fell in June, as many automakers were unable to keep up with rising demand for small cars. 
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