AWF87M2 I use E85 for cleaning
and 1-200 miles before oil change the Techron stuff (since I bought a pack at Costco for dirt cheap)
DigitalNav Rheingold will help you tremendously to find any errors/issues with the car. When I Unlocked my car, the mechanic himself forgot to tighten 2 sensors and I had some funky codes (no CEL) ; not related to the tune or anything. Went back to the shop, mechanic used Rheingold and found the sensors he had to push in.
Your BoostLeak could be anywhere near the Throttle Body or Charge Pipe since they have to unplug that to reach the ECU