Has anyone considered that these cars have 2 fuel tanks when adding octane booster? I would like to better understand how the fuel flows between the 2 tanks to ensure that my mix is correct and don't get too much in one tank only. It is obvious that mixing in a separate tank first is optimal, but not practical. How do you add yours? Does the fuel pump still circulate fuel if the key is on and the pressure has met the steady-state, or does it only pump and circulate when pressure is needed?