I've been mostly PI-ing at Oil Refineries, but also on upstream operations, cheese factories, breweries, pulp and paper plants, nuclear generators, dog food plants, water treatment/distribution, pharma...petrochem, specialty chem...

When I was at OSIsoft the office was working on an interface for auto information..one of those "just for fun" things for a Users Conference.

Of course the PI System is best suited to continuous processes as it's not a transactional system per se... but to take your auto idea a little further, imagine the interest that ship operations monitoring could have, I mean those things are like massive floating plants....airplanes too... there has been interest from aviation companies in PI.