Martin Lewis has advised motorists never to hit the garage for fuel at 5pm . The host of BBC Sounds podcast and regular on ITV shared that those who choose to fill up their cars in the evenings are tipped to get just a "little bit more" petrol or diesel. He revealed: "Talk of filling up at night getting you more is a slight urban myth, as the difference is minuscule pennies at best. Fuel pumps are calibrated by volume, so fill up at night when it's colder and you get a tiny, tiny bit extra."