Todays Rant- Are Car Makers Going The Wrong Way? As gasoline prices soar, car manufacturers are pushing hard to make fuel efficient cars. The different methods of getting there by these manufacturers are 1. More fuel efficient engine 2. Variable valve timing (VVTi, Vtec etc), direct injection technology (Dicor, CRDe etc)... Similar Editorial : Todays Digital Photography by Christian Young. | Source : Hydrogen Diesel