My best time in my 100% stock power Redeye (just rear MT ET Rs) is with a 1.47 60ft, 6.68 1/8th, 10.46@130.58 (1900 DA, high 40s, with a track at 2350ft). I haven't noticed a hiccup and I've been running 92 octane, which is mostly what we have. Just found a Chevron 5 miles away that says it's 93 pump, and another one 25 miles away. I have never logged any of my runs. Didn't know you could do that on a stock car. I'll have to look into getting a MPVI2 and cable, does Diablo have anything they data log with, or is the HP tuners way cheaper? I've never logged before, but I can't imagine it's all that difficult. I'm curious to see what my car will show on 93 and if an octane booster might be helpful.
Good luck Ron, I hope the octane turns out to be an easy quick fix for your hiccup.