Timmee, Chimbu, guys, give me a break! Father knows how to pee!
Pre departure, FOB*0.75 for 3E and FOB*0.7 for DP is as close as dammit. Nil wind SGR's are in the region of 5.5kg/nm normal ops, 5.3 for one inop, and 6.5 for DP. Increase/decrease by x per 1,000kg weight, etc.etc.etc.etc
I own the gadget, it is already in my pocket, I know how to program it a bit, so let me have my fun! Some guys get their jollies doing up old cars and making them go faster. They might not go faster in proportion to the midnight oil you burned on them, but you learned a thing or two while you were trying.
Now if anyone would like to answer the question as posted!!!!
Humbly
ITCZ.