I don't recall ever trying Octane boost with prem gas . I have used it several times over over the years however .
One of the first , was on the Orvis after installing the perf PCM . I had just filled with regular , and the thing pinged like crazy . Instantly , after adding Lucas , it was totally gone . I was pretty impressed with the Lucas for that alone . Great for anyone who's vehicle requires higher octane fuels and only reg. is available .
I also find that I sometimes get better results from Octane boost and regular gas than I do from prem gas (mine both require high oct) . Makes me wonder if I'm not getting shafted paying prem price for regular gas . It's really not hard to notice the difference burning regular gas vs premium in the 5.9 . I have my wife using prem gas in her Aveo . It gets better mileage , and makes the car more tolerable to drive . I can run faster when it's burning reg gas .
Does a higher anti knock index make more power ? No . It maximizes efficiency . I have always found vehicles run smoother on prem fuels , quieter , better throttle responses , and usually better mpg . I find better results from smaller engines more than V8's
Premium fuel fine tunes the timing . By having a higher AKI , it allows the compression stroke to finish before detonation , allowing max compression at the time of ignition . By doing so , it's going to create the most powerful explosion inside the combustion chamber possible for that engine , at the right time .
No , I don't think octane boosts should be used regularly as a dd'er . They do have some good situational uses and I suggest Lucas if your gonna use anything off the shelf . There are properties in the prem gas/additives which can remove carbon build up in engines . This alone can make for better overall efficiency . On vehicles that don't require premium , I think it is good practice to run a tank of premium through every 5th tank . Consider it your monthly additive
To answer the OP's question , prem gas + boost is not recomended . The higher AKI of prem fuel is more than sufficient to maximize benifits . It can be harmful to your emmisions system . It can also rob you of HP at higher rpm's . It will result in build up and deposits on the plugs , fouling them up , with regular use . Next time , I'd suggest google , there's alot better info in the racing world on this subject , I must have read 20 articles and forum debates
it was quite educational .