The issue focused on cars using engines produced from naturally aspirated technologies (such as diesel engines). Since technology advances such as turbocharging were introduced with automobiles in the 1960s, technological advancements have opened up engines that run at higher pressures and temperatures than engines typically used today. These improvements include electronic fuel injection (EFI), parallel engines and hybrid systems. All these improvements improve efficiency by improving combustion efficiency and emissions control. As cars continue to expand their vehicles to handle greater loads and operate more efficiently, engineers will look for