Mazda boosts petrol engine efficiency in fresh blow to diesel

Japanese carmaker says from 2019 it will sell cars fitted with engines that largely eliminate need for spark plugs, improving fuel consumption by 30%One of the world’s largest automotive firms has hailed a technological breakthrough for the petrol engine, in an engineering twist for an industry racing to embrace the electric car.Japanese car manufacturer Mazda claims to have designed a vehicle that will largely eliminate the need for spark plugs in petrol engines, increasing fuel efficienc