The Peppermill Crank Gun has no upgrades at the vending machine and you cannot purchase ammunition for it. It is dropped by Motorized Patriots when killed. After obtaining one, begin killing enemies with it until it is out of ammo. Repeat the process if necessary.
Start "Return to the Hall of Heroes" and use the doors behind you to enter The Hall of Heroes. Once inside, exiting to the Plaza will cause items in the Soldier's Field area to respawn. You can use this to your advantage to farm gear. Go to the Plaza and defeat the Vox and Founders. You should also use the sky-lines to travel to the lower Gondola Station and defeat the Founders and Fireman. There is also a Motorized Patriot in its entrance hall. Simply stun it, go to the elevator, and use it to return to the Soldier's Field boardwalk. Find the toy store next to the carousel and lift its shutter to enter. Use Shock Jockey on the generator near the locked door to open it, allowing you to collect a piece of random gear. Return to the Hall of Heroes by using the elevator and the sky-lines. Enter the doors to the museum. Once inside collect the Salts and repeat the process.
On the way out of Hall of Heroes after fighting Slate, ride two sky-lines to find get into fight that includes a firefighter that always has a lockpick. Defeat him, collect the lockpick, and return to the Hall of Heroes. After entering the building again, exit and ride the sky-lines to find the same firefighter. Repeat the process as many times as desired.
Go to the Hall of Heroes and possess the vending machine on the right side of the steps that lead to the building's entrance to get a random amount of money. Enter the Hall of Heroes, run down the hall, and refill your Salts. Leave the building, return to the vending machine, and repeat the process.
At the Main Title Screen, Prior to making any selections.
Use the indicated Vigors in the listed order on the same enemy to perform corresponding combo.
Search the indicated location to find the corresponding Vigor.