NOVELTY - The cell (10) has a set of negative electrode plates (18) placed inside cell housing (12). A hydrogen discharge port is placed on the housing and adapted for connection to a fuel system of a vehicle. A moveable plate rod (32) is attached to the plates, where an end (33) of the rod extends outwardly from the cell housing, and is adapted for attaching the fuel system. The rod moves the negative plates toward positive electrode plates (16) during vehicle acceleration. The rod moves the negative electrode plates away from the positive plates during vehicle deceleration and in an idle state.    USE - Oxyhydrogen (HHO) electrolysis cell for generating adjustable amounts of hydrogen to a vehicle's fuel system i.e. carburetor. Can also be used for gas generators, diesel generators, stationary and portable gas and diesel engines, compressors and pumps.    ADVANTAGE - The cell generates hydrogen to different types of vehicle fuel systems for increasing mileage and fuel efficiency. The cell is designed to increase the amount of hydrogen to the fuel system with increased vehicle speed from idle. The cell can be easily mounted inside a vehicle and attached to a vehicle's battery and fuel system for becoming operational, and can be used with various types of fuel systems for operating stationary and portable equipment with improved fuel economy and fuel mileage. The plate rod moves the negative plates toward the positive plates when the vehicle accelerates in speed from idle, thus increasing the amount of electrolysis of the water in the cell housing, and hence increasing the amount of hydrogen generated in the cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a HHO electrolysis cell with a portion of a cell housing cut away to illustrate spaced apart positive and negative electrode plates.    HHO electrolysis cell (10)    Cell housing (12)    Positive electrode plates (16)    Negative electrode plates (18)    Hydrogen fuel port (20)    Negative pole (26)    Moveable plate rod (32)    End of rod (33)