Abstract: This invention relates to a vacuum controlled apparatus to be placed between the foot accelerator of a vehicle and a carburetor of an internal combustion engine to regulate the opening of a throttle on the carburetor to maintain a relatively high vacuum in an internal combustion engine for better efficiency. The apparatus additionally effects gasoline savings and restricts the emission of pollutants into the atmosphere through the auto exhaust system. There is a housing containing a vacuum seal means generally controlled by the vacuum from the manifold of an internal combustion engine through an appropriate take-off. Additionally, spring means is associated with and co-act with the seal means to assist in the controlled opening of the throttle.