The price of gas increased, which means fewer people will buy gas in the future.
When the price of something rises, usually there is a lower demand for that item. People don't usually demand an item when it is set at a higher rate because they don't want to spend more money on something. Gas is a commodity that fluctuates in pricing often, so even though less people are buying it now within a week it could drop significantly lower and then more people would be making the purchase. Regardless of the price of fuel, if there is not a shortage, the supply will remain the same.