Unless it calls for premium gas in your owners manual your wasting your money using premium.
yes.....you can put 30z on a dodge charger if you want.
6.1L Hemi
Yes
Anything is possible. That would require major modifications.
Turbo chargers and Super chargers will both fit on Dodge Chargers
sure but you will have to change a few things to do it.
Premium is ok
1966 was the first year of the hemi in the charger and the first year of the charger also.
My opinion, No.
5W20
Probably
as many as you put on it.