Have yet to hear a single ping using 87. guess it depends on the area where you live and purchase gas.Really though, the stock 3.6L Pentastar in the JL, with its bumped up compression from the JK, SHOULD be running premium as-is. I ran a tank of 93 through my bone stock Pentastar and it ran noticeably better. No more detonation, less stumbling at low RPM, and just an all around smoother running engine. Went back to 87, and all those previous little buggers showed back up.
I made a rough estimate that, at $0.50/gal more expensive (which it's been closer to $0.70/gal lately but I wanted to be conservative) and averaging 16mpg, it would take about 32,000 miles to spend an extra $1000 on fuel. I ran down this line of thought because I thought that, if the Livernois tuning alone on the 87 tune can work out many of these bugs, it would pay for itself with a better driving experience after 32,000 miles. But, with the compression ratio of these engines being over 11:1 now, I'm not sure what tuning can really do to work out all the detonation and stumbling and rough low-RPM running while still running 87 octane (and most who get the tune crank it up to the 93 or E85 tunes because horsepower).
Anyway, just a thought. If I weren't unemployed (ahem, I mean self-funded), I'd probably have already ordered a Maggie blower kit and had Livernois set up the tuning and just commit to the $3k extra fuel spend over the next 100k miles.