Gas prices pull back further
Prices for gasoline, diesel and ethanol extend decline, according to AAA survey.
NEW YORK (CNNMoney.com) -- Prices at the pump continued to fall overnight, a nationwide survey of gas station credit card swipes showed Monday.
Regular: Regular unleaded fell to $4.069 a gallon, down from $4.077 the previous day, according to a daily survey from motorist advocacy group AAA.
In the past year, gas prices have risen more than 36%, causing Americans to cut back on travel and spend less in other areas so they can fill up their gas tanks.
Ethanol: The price of E85 ethanol, which is made from corn and other crops, fell to $3.298 a gallon on average.
While ethanol is derived from renewable sources, it is also less efficient than gasoline. As a result, E85 costs about $4.34 per gallon to get the same mileage as gas as of Monday, the AAA survey showed.
Diesel: The average price of diesel fuel, which is used to power most trucks and commercial vehicles, fell a penny to $4.818 a gallon from $4.828, according to AAA.
Diesel remains more than 63% higher than last year when it was cheaper than gas.
State prices: Gas prices in Alaska, the state with the highest prices, fell to $4.666 a gallon from $4.674 the day before. Hawaii, the state with the second highest prices, saw prices fall to $4.461. California prices fell a penny to $4.444 on average.
Drivers in Oklahoma paid the least for gas at $3.862 a gallon. Missouri was the next cheapest state for gas with drivers paying $3.874 on average, followed by South Carolina at $3.878.
Hawaii had the highest diesel prices at $5.365 a gallon, while diesel was cheapest in Oklahoma at $4.626.
The AAA survey averages credit card swipes at 85,000 fuel stations around the country. 
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