I agree with David, Big Oil companies are forced by governments to sell petrol to joe public as a way of governments trying to absolve the guilt of selling all the natural resources of their country to fill their coffers and get re-elected. They make bugger-all money from petrol stations, so blockading them is just going to make life even harder for the minimum wage employees, and yes the franchise owner who probably struggles mightily. If you DO want to protest, then it's far more effective going to their HQ. Although it's not as if BP is collecting oil just to store it under their stairs. They drill it because we, as a society have a ridiculous addiction to it, and we want it cheaper. Our society's habits are not going to change if a BP or a Shell somehow was put out of business.