Since finishing this project it's done over 200nm without a hitch, maybe the lack of a bilge pump was an error but that's now sorted.
The engine just seems to get better and better. The other night myself and the missus took it down to the Green Isle on Loch Shiel, total distance coverered was 19.74nm, I popped in exactly 20l into the Barrus tank and I ran out about 20yrds from the pier, it looks like the magical 1l/nm was achieved
There is a glen down Loch Shiel I visit regularly called Glenaladale, if I take the Orkney Longliner with a Honda 15hp Il use a gallon of fuel but it takes quite a while, if I use the Rib Il use a gallon but get there in jig time.
It all seems relative.
Sorry about the random pictures, just some of the green isle.