85 gals for a 30 mile round trip?
Yep, you are about right.
The tide is setting east at the moment, so i should think a Brittany ferry has mowed them down by now.
It might be worth a trip to Selsey/The Witterings this evening.
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams