a off the shelf JWT ECU, dumps in the boost jets, adds exhaust and what not. He was running a stock Z, which everyone on here would say he was an idiot for not running 91. Car was hitting about 13.5:1 @ 9.5 psi and running perfect on 91 as the manual states.
Now he is at 14 psi hitting 16.5:1 and still running on 91 just fine.
Would that not lead you to believe he could have ran less than 91 just fine with 9.5 psi?