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I guess. I'm not sure what draw back means in this context. Anyway, I would assume no power difference was felt because it takes longer for the knock learn factor to rise than fall, if he only ran one tank perhaps.
It's been proven again and again on dynos that you'll see power gains from 93 over 89. Not sure why we think the keyboard pounders are wrong. Some of them run shops and tune hundreds of these cars.
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13
Mods being installed-
oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc.
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