Hopefully, there is an attorney in the area who is also a pilot that will volunteer to defend the pilot pro bono to spare him the expense of fighting this idiotic suit. Also, AOPA needs to file an amicus curae (friend of the court) brief to help put a stop to this type of tactic. Better still, the FAA needs to step in and inform the (state) court that they have no jurisdiction over the matter since fuel specifications and STC requirements dictate that the pilot is in compliance with FEDERAL laws in using 100LL. The biggest problem with this type of legal action is not that you cannot easily defeat it, but that one has to spend their own money and time to even address it.
Unfortunately, I think we all know where this is headed. GAMI had better get busy making more G100UL.