Just coming into this thread late. Mine is a March 2014 S85 with about 53K(?) miles on it. I have not quite let it get all the way to full in a couple of years, but in the past couple of weeks I was on a trip, and it was almost full, where Supercharging was tapered down to about 20kW, so it was at the somewhere around 97-98% level probably, and it was just getting to about 250-252 ish miles I think.
So consensus seems to be that it should normally be somewhere around 250. The OP has 233 showing from the original 265 value. That is down by 32 miles, which is 12% reduction. That seems a lot lower than what should be normal. 83K miles is a little bit high, but most of the people reporting here are around 50-70K, so it should be pretty close.
Regarding touchscreen bubbles: pretty sure that's because of the extreme temperature cycles in a car. Mine got bubbles on it a few months ago, and I just got it replaced under the wire before my initial warranty ran out. Mine wasn't leaking any goop, but I think those are air bubbles where the seal between the layers pulls apart a little.