Ok this is strictly anecdotal, I know no one has tried this and Terry and other tuners don't recommend it, but, I have been running my JB4 on stock plugs since day one and have managed to progress to higher maps with no misfires (yet). I originally ran it on map one for a couple thousand miles, figuring I would eventually get around to having the new plugs (riding in the glove box for months) installed. Then I figured the only way I would actually change them was if I had reason to, so I set out to see how high I could go before a plug blew.
I started with map two, with Shell 93 in the tank. After about 200 miles of no stuttering or issues, I got more 93 and added some Kroger E85 (the only place I've found around here) and tried map 3. It's been more of the same, strong pulls, no hesitation and no misfire.
That's as high as I've gone so far, and again, I WILL get the plugs changed when I have time. Just sharing this because I'm surprised I've been able to go this far on stock plugs, when, for comparison, I blew two of them after just a week of using the lap3 chip.