Hoarding isn't going to be the answer... imagine the money that you have to spend in order to get all the gas containers needed to even make a difference. If you have a 5 gallon gas can (which is priced out on Amazon at just about $20) and you need 15 gallons to fill up your vehicle, then you have to spend at an average of $3.50 per gallon (which is about what we have here in California), filling up your car just once will cost you $112.50!!!
So, unless you already have a ton load of gas cans just laying around... filling up a 15 gallon gas tank at $4 sounds pretty cheap in comparison!
By the way, that is $112.50 per time filling up. I know I go through about one tank of gas a week. And hoarding the gas will be more expensive then just getting the gas at the price it is. The only benefit... if everyone hoarded enough gasoline to make it so they did not have to purchase gas for at least a month all at the same time... then, like kgormley said, then they might be forced to lower their prices! But, once people start purchasing gas again, those prices will go right back up!