stock Float:GetVehicleSpeedFromVelocity(Float:x, Float:y, Float:z)
{
    return floatmul(VectorSize(x, y, z), (type == EI_MATH_SPEED_KMPH
        ? 180.0
        : 111.846814));
}

stock Float:GetVehicleSpeed(vehicleid)
{
    static
        Float:x,
        Float:y,
        Float:z
    ;

    GetVehicleVelocity(vehicleid, x, y, z);

    return GetVehicleSpeedFromVelocity(x, y, z);
}