Following Volkswagen's introduction of the first direct-injection of gasoline into the engine cylinder, the fuel stratified injection (FSI) engine has produced significantly higher efficiency and is becoming more and more widespread. This technology was followed by auto-gas technology. The first widespread solutions in use are classic custom gas phase systems, where the engine loses all the benefits of the direct injection.

However, new liquid phase injection systems are already emerging on the market via petrol injectors, which however have problems at extreme temperature conditions in winter and summer, with performance on high-power, high-consumption engines and high cost. Independent tests have also identified and confirmed these problems.