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This paper introduces for the first time a new concept in fuel/air handling technology that has been shown to deliver reductions in fuel consumption and CO₂ emissions in port-injected gasoline engines. Whilst direct injection provides a route to significant improvements in gasoline engine efficiency there are drawbacks in terms of cost, complexity, particulate emissions and NVH. The technology presented in this paper offers a route to improving the efficiency of the conventional port injected engine. The technology essentially consists of a system that mixes fuel and air, promotes exceptional levels of swirl and provides a low level supercharging effect. The system sits between the fuel injector and the inlet port, with one system per cylinder. A simple prototype system has been fitted to a 1.6-liter Ford Focus, with independent testing showing up to 9% reduction in CO₂ emissions (and commensurate reductions in fuel consumption) and up to 40% reduction in NOx.