New Delhi, May 23 -- Gas prices were at a four-year low just ahead of the Memorial Day weekend as millions of Americans prepare themselves to hit the road.

As per numbers from the US Energy Information Administration (EIA), the average US retail gasoline prices going into Memorial Day weekend were 14 per cent lower than last year when adjusting for inflation.

On Monday, the average retail price of regular-grade gasoline in America was recorded at $3.17 per gallon, which is 11 per cent lower than a year ago, EIA said.

Gas prices normally increase between the spring and summer months due to factors including increased demand for travel as well as refineries producing summer gasoline blends that are costlier to manufacture.

Over the last...