The price of gas is expected to continue to decline through the end of the year. Federal numbers from the United States Energy Information Administration says the average price for a gallon of gas is about $2.21. In many locations in Arkansas, the price of a gallon of gas has been well below that, with gas averaging around two dollars a gallon. According to Talk Business and Politics, prices of gas in northwest Arkansas was about $2.04 while central and eastern Arkansas has prices around two dollars, or just below two dollars. Drivers of tractor trailers and diesel vehicles are seeing those prices average around $2.32 a gallon. Projections are that gas prices will continue to fall this holiday season. Which states have the highest gas prices? Hawaii at 2.87 a gallon, California at 2.84 a gallon are the most expensive, followed by Nevada, Washington State, and Oregon.