According to Gasbuddy, a platform that helps consumers find the lowest prices on petrol, Mississippi at $ 2.70 a gallon ($ 0.71 per litre) has the cheapest gas, and the cheapest petrol station in that state is currently selling gas at $ 2.37 ($ 0.62 per litre).
In recent weeks long queues have formed at petrol stations, with drivers often waiting for days.