Amazing that people here don't understand that the gas at the pump comes from a refinery, not from a saudi oil tanker ship. The barrel of oil is the raw material for the refinery.
Expecting the price of gas to fall with the price of oil is like watching the metals market and expecting the price of a can of Pepsi to fall with the price of aluminum.
"Hey, the price of aluminum is down today. Why does a Pepsi can still cost $1.00 from this machine?"
Refineries are a monopoly and a tightly regulated market. No new companies are allowed to refine gas. The few players can do what ever they want. Screw you. Don't like it, then run for Congress.