400 nm cruising range @ 18 -20 knots plus a 20% reserve.

I’d say you would want to check your maths. A Beneteau Flyer 12 has 1200L diesel tanks. Based on the common figure of 1mpg (1 gallon = 4.5L) that we often hear for a 40ish footer, you’ll be burning 90L per hour at 20 knots. 20 knots for 400nm takes 20 hours. So you’re talking 1800L for that trip.
I will indeed. You make very valid point and I have more than likely got it wrong. Going slower to extend the range would take it beyond 20 hours continuous running which is stretching the possibility to far.
Thank you for your reply.
 
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