So if gas at the pump costs the consumer $2.70, how much do you think it costs big oil?
To produce? Depends where they get the oil from. If they own the well, and don't have to pay higher royalties or taxes, then costs haven't gone up. If they are buying the crude, then the costs have goneup hugely.
The things is, though, why should Exxon take a barrel of crude, refine it, ship it and sell it US consumers for less than they could get selling it abroad? Why should they go to the international petroleum markets, buy crude, refine it, ship it and sell it to American consumers for significantly less than it costs?
The price of oil has gone up, because there is more demand and restricted supply. That means you either pay what it costs, or do without. Increased cost reduces demand, so it's a self regulating market.
The only way you can reduce what you're paying for oil is to use less, produce more, or reduce uncertainty in the market.
Trying to regulate the price will just reduce supply, as the foreign oil producers are going to sell at the market rate, not the price you want to pay.