Wow!
"At wind of over 12 knots, and anywhere from 10 degrees onwards off the nose, IETA can self-produce up to 1 knot of additional speed, (or when the wind is to beam)"
Cruising at 6-8 knots she has a range of 4300-7000 nautical miles, and she has 1700g (6500L). So guess would be around 1L/nm...