The "new" type anti-freeze is not the same as the old type. It's been made safer, and therefore, it's less deadly than it used to be. It's too difficult to consume enough of it to die. Your body will recognize it as poisonous and take immediate steps to expel it (vomiting). As the other poster said, you'll suffer irreversible damage to multiple organs. It would be best if you found a better way, if you're really intent on CTB.