As the years go by, more and more cars are adopting hybrid technology, which can be used to help provide a boost in range. This is because these hybrid cars can generate extra energy as you drive and brake and then be used to help give you a few more miles.  This hybrid technology is what's behind many petrol cars being able to get a mileage similar to or even greater than diesel options. It will surely have a major influence as laws and bans on new full petrol and diesel cars are introduced in the coming years.