A WRAL story on the gas tax reports that taxes don't really factor in to the price at the pump.
WRAL could not have gotten the story more wrong. This excerpt from the online version says it all:
"Foster and other DOT officials argue that there is little correlation between the gas tax and the actual cost at the pump. Whether a station in Raleigh charges $3.47 or $3.59 a gallon, the tax is the same, they said." (emphasis added)
Whether a station charges $3.47 or $3.59 a gallon depends on location and competition. Yes, the tax is the same no matter the station but that gas tax still adds an additional 32.5 cents to the cost of every gallon of gas.
NC gas prices currently average $3.50 a gallon so the gas tax is actually almost 11% of the price per gallon.