Been out today - as ever this year thrashing about in seriously lumpy sea for a silly little rubber boat but it was fun (mostly). Did 2 hrs 40 mins moving time, max speed 18.5 kts, average about 8 kts burned about 10 litres and did 20 nm. So 2nm a litre or 3.75 litres hr. Only a 15 hp remember...
Saw a seal though. First one ever for us off the Sussex coast.