"...Thanks, so jealous! Fuel consumption is very impressive, ..."
Yes impressive but in witch way ?

At 8 kts 1.42 liter per nm it is 24% more than our former boat
At 9 kts 2.94 liter per nm it is 65% more than our former boat at 9.8 kts
I like the concept of this boat but can't say the consumption is the main argument

On their Atlantic crossing they put 3600 liter for the E4 "Duke" at an average speed of (around) 7kts ( on the bottom, don't forget on an Atlantic crossing you can benefit of around 0.5kts of current on the right direction )
After 1060nm they used 1250 liter it means 1.18 liter per nm
When the current became even more favorable they do 7 kts on the ground for 5 l per hour : 0.714l per nm
The E3 Valentina arrive with only 60 liter remain in the tank.
During the crossing the smaller E3 must bring some jerrican to the E4.
2580 nm for around 3000 liter 1.16lt per nm at probably 6.6/6.7kts on the water.
1.16lt it is + 43% than our former boat at 7 kts and ...26% less than our actual :-(

What I like in the E it is : low profile, self righting but for consumption no choice must be long, narrow or/and (very) light.
And for very very good consumption must be like the power tri of the member BOATGM or the scalled down Stiletto
In 1936 Marin Marie cross the north Atlantic from NY to Chausey. On small motor boat (former motor sailor hull) with the engine at 600rpm he reach 7kts for 7l per hour, at 730 rpm it was 8.3kts for10.50l per hour. He crossed at an average 630rpm.
with the "help" of wind and current he made some nice day record : 207.188.190.195.203.195197.193.208.203.224.205.217..
18 day and 22 hours for the 3200nm .
For the first 2400 nm he used 2600 liter : 1.0833 l per nm