Mixture works to improve fuel/air ratio. Check EGT needles. You can use the tmd to set fuel quantity to 0.5 for half fuel, or any amount greater than yellow band for legal takeoff. Fly til you exhaust supply, engine spits and sputters and quits. Feather and get ready for the other one to conk out. Feather and find a good landing area. Use full flaps and gear down. Enjoy.
Ray