A vehicle with a mixed gas generating system comprising: an internal combustion engine capable of using a mixed gas composed of carbon monoxide and hydrogen as an engine fuel; mixed gas generating means provided with: carbon dioxide absorbing means provided in a bypass passage bypassing a part of an exhaust passage of said internal combustion engine and containing an absorbing liquid having a carbon dioxide absorbing characteristic; an electrolytic bath connected to said carbon dioxide absorbing means and containing the same type of solution as said absorbing liquid; absorbing liquid storing means provided between said carbon dioxide absorbing means and said electrolytic bath and temporarily storing said absorbing liquid sent from said carbon dioxide absorbing means; and absorbing liquid circulating means (32,34) for circulating said absorbing liquid in said carbon dioxide absorbing means through said absorbing liquid storing means and said electrolytic bath and back to said carbon dioxide absorbing means, and generating said mixed gas by electrolyzing carbon dioxide contained in an exhaust from said internal combustion engine and water, respectively; mixed gas supply means (16,38) connected to said mixed gas generating means and supplying said mixed gas to said internal combustion engine; exhaust pressure obtaining means for obtaining an exhaust pressure flowing through said bypass passage; and liquid sending amount control means for controlling an amount of said absorbing liquid to be sent to said absorbing liquid storing means from said carbon dioxide absorbing means in accordance with said exhaust pressure. an internal combustion engine capable of using a mixed gas composed of carbon monoxide and hydrogen as an engine fuel; mixed gas generating means provided with: carbon dioxide absorbing means provided in a bypass passage bypassing a part of an exhaust passage of said internal combustion engine and containing an absorbing liquid having a carbon dioxide absorbing characteristic; an electrolytic bath connected to said carbon dioxide absorbing means and containing the same type of solution as said absorbing liquid; absorbing liquid storing means provided between said carbon dioxide absorbing means and said electrolytic bath and temporarily storing said absorbing liquid sent from said carbon dioxide absorbing means; and absorbing liquid circulating means (32,34) for circulating said absorbing liquid in said carbon dioxide absorbing means through said absorbing liquid storing means and said electrolytic bath and back to said carbon dioxide absorbing means, and generating said mixed gas by electrolyzing carbon dioxide contained in an exhaust from said internal combustion engine and water, respectively; mixed gas supply means (16,38) connected to said mixed gas generating means and supplying said mixed gas to said internal combustion engine; exhaust pressure obtaining means for obtaining an exhaust pressure flowing through said bypass passage; and liquid sending amount control means for controlling an amount of said absorbing liquid to be sent to said absorbing liquid storing means from said carbon dioxide absorbing means in accordance with said exhaust pressure.