Is it really that important?
In the entire scheme of life, is this something you need to worry about.
The average wind for Oxford during July is south westerly at 7.8kt!
The above statement proves my point. Just stop that type of stuff . Its sad.
'Pretty much' means; had a look at performance figures because i have flown in there in the saab but not going to work it out to 1kg for the purposes of pprune because i have a life.
No offence.
p.s That weblink to Saab AL. We dont use that. We have a book filled with numbers. Really, I've seen it.