Abstract: For use with an internal combustion engine, typically the multi-cylinder variety, an apparatus which cooperates with the carburator and air intake manifold, which incorporates a flat plate-like member having appropriate passages enabling it to be bolted to an intake manifold below a carburator. The carburator mixes vaporized liquid fuel and air to provide a combustable mixture. The apparatus injects air at a point well within the intake manifold to enable the mixture of air injected thereat to disperse in the manifold air stream and flow to the cylinders of the engine for combustion. Air injected at this point is beneficial in improving fuel performance of the internal combustion engine. All other factors remaining equal, it provides better fuel economy.