“Instead, inflate your tyres to the level advised by your garage and top them up whenever needed.
“It’s best to check your tyre pressure before heading out on long journeys, as this is when efficient fuel mileage is most important (both in terms of safety and saving you money).
According to Kwik Fit, tyres account for up to 20 percent of a car’s fuel consumption, so it’s important to choose the right ones.
Tyres with high rolling resistance will use more energy, and more fuel as a result, while those with a lower rolling resistance use less energy and fuel.
source: express.co.uk