Yes. That WAS gasoline. The car has sat between 4 and 6 years. The original owners said that they stopped driving it after COVID hit. Each of those plastic DEF bladders has about 2.5 gallons in it. I think I have about one more bladderfull left in the tank. I'm going to take it to a hazardous waste facility to recycle/reclaim/destroy.
I'm not entirely sure what kind of seat cover that is. IT appears to be kind of a saddle-blanket with a nylon sleeve sewed into it so that it fits around the seat entirely. It's kept in place with sheet garters. I can look for a brand if you'd like. Leather seats, or what's left of them, are under the covers. The rear seat is just a nylon sheet tucked into the gaps. I'm not sure the condition of the rear leather yet.