The enormously tall square knobs along the edge of the tyre mean it grips like mad, but clearance on a 'Cross bike is pretty tight; tight enough that I had to trim down the knobs to make sure I wasn't rubbing on the chainstays or fork, in fact.
As a mountain biker, this makes absolutely no sense to me, especially since Panaracer is trying to push it as a tyre for mountain bikes, in which case the absolute maximum that you'd want to run your pressure at would be 50-60PSI, and that's if you're riding exclusively over gravel and grass. Setup tubeless especially, there's absolutely no reason not to let that air hiss right out of your tyre down to 40, 30, 20 PSI depending upon conditions. I did try to humour Panaracer by running about 60PSI for about a mile, but the ride at that pressure was still incredibly harsh. Even at lower pressures the ride feels abnormally harsh for such a (comparitively) high volume tyre, probably due to a lack of suppleness and the added support in the tyre's sidewalls.
Ultimately, I've found that 30-40PSI is the sweet spot for dry conditions, with no issues of burping or slipping off the rim on corners so far. If you must run the rear tyre, higher pressure will keep you rolling a little faster without a huge penalty to grip but with a pretty harsh ride.
On the flip side, flats and long climbs show the ugly side of the high-profile, and thus high-resistance tread. If you aren't descending these tyres feel painfully slow as compared to more traditional Cyclocross tyres, which is the tradeoff for the extra grip in the steep bits. After playing around with different tyre combos though, I have found that a lower profile tread in the rear paired with the Fire Cross up front feels quick and lively while also providing that extra grip for descents.